I've reached a point where I am comfortable in Japanese with most grammar points, conjugations, etc, and most of the problem in advancing faster in written material comes down to Kanji recognition.
In theory you could pick up Kanji gradually on an as-you-go basis while engaging with translating or studying other materials, but since there's no real way I know of to make them stick quickly that way, seems to me tackling them head-on as a special memorization project is worth the effort. This is probably even truer in learning Chinese languages, because if you know kana you can get further with that in Japanese (and the input methods I've used in computers have pop-up Kanji), but in Chinese you pretty much either must know the characters or you're just SOL and can only look them up or else guess the meaning from surrounding context from the ones you do know.

Anyone else ever done this, front-loading your memorization of the kanji/漢字 up front?
Do you have a favored method that worked for you?
If so, how fast were you able to memorize the 漢字?
How many of them did you memorize?
Are you fully fluent (e.g. can pick up almost any book in Japanese or written Chinese and understand all or almost all of it)?
Here's my plan:
Step #1 = Memorize all the radical elements (sometimes called "primitive elements") that have a meaning of their own as ideograms in many cases, but which are used as "building blocks" of other 漢字. Sometimes they go together with clear symbolic picture meanings (森 with its three 木 ideograms combined to mean "forest," for example), other times there's no obvious reason why certain radicals were used (sometimes just for phonetic resemblance), but even for the puzzling ones it still really helps to know the individual meanings of all radical elements, I think.
Step #2 = Put together a list of related characters and learn them in sequence, coming up with some mnemonic to try to aid speedy memorization and retention.
@Lucas88 recommended the Basic Kanji Book and Intermediate Kanji Book series in a nice post here: viewtopic.php?p=371768#p371768
Those seem pretty great too. (I just got them and will check them out in more detail soon.)
The main I'm trying out first though:
The "Remembering the Kanji" book series that's been out in various editions since at least the 1980s teaches the most common 3,000 kanji in a clever way, by building a sequence of related kanji that share radicals and other components with each other, and makes them more memorable using mnemonics that anchor some type of imagery in the mind.
You don't have to use the author's specific suggested mnemonic ideas, but I think it's a good concept that works better than learning them at random, and he seems to have been quite smart about his choice of the sequence.
For example, some of the first ones he links together after the Kanji for the #s 1-10 (一 二 三 四 五 六 七 八 九 十) are: 口 日 月 田 目
So we start with the mouth/cave radical, then the sun/day, rice field, eye, and then get to ones like 古 吾 冒 朋 明 that are composed from combinations of what we've already learned. So he has a short paragraph featuring each one of these and explains what radicals and shared elements they use, and gives some suggestions on mnemonics.
(I'm partial to the idea of learning the 214 radical elements up front, but otherwise I like this concept.)
One very different thing about this program is that "Remembering the Kanji" actually doesn't teach you the sound readings, just the ideograms and their meaning and elements!
I sort of see the point of that (especially in Japanese since they have both an onyomi Chinese reading, and kunyomi Japanese reading), but I personally think it helps engage the maximum number of senses to create really memorable mnemonics, so I'm probably going to add the sounds to my own study.
In accord with polyglots making a mess of things (but hopefully with method to the madness), I might actually learn the Cantonese readings of them all first (which are actually a lot closer to the onyomi because of Cantonese being more similar to the Middle Chinese spoken when Japan introduced these than the more modern Mandarin). And see how much "automatic" Cantonese I end up understanding by learning all the characters, since almost all Cantonese and written Chinese grammar is much easier than Japanese grammar... and then I'll get the onyomi vs kunyomi Kanji readings figured out when I'm tackling Japanese translating again after learning 2-3,000 kanji/漢字 first...
Interesting question on this note, for polyglots:
I wonder if it's a good idea to learn both the Japanese and Cantonese sound readings (or other Chinese language sound readings if you were learning Mandarin or a different one) at the same time.

I know many people who think you should learn one language at a time would advise against that... but I'm considering doing that.
To some extent I've already done this, and when I see the kanji for numbers for example I'm immediately hearing Cantonese:
一 二 三 四 五 六 七 八 九 十
=
"jat1 ji6 saam1 sei3 ng5 luk6 cat1 baat3 gau2 sap6"
and if reading/writing in Japanese I consciously mentally switch to "ichi" "ni" "san" etc in Japanese.
I wonder how many it's possible to learn each day if you take a focused approach?
This site here suggests learning the radicals, then breaks it down to 11 characters learned per day to get you through the 1,000 most common in about 3 months:
https://www.fluentu.com/blog/chinese/le ... ee-months/
I wonder if you'd come out stronger trying to overdo it and memorize even more, then go back and re-study the ones that slipped your mind, or if it's more beneficial to limit the # of characters you try to take on per day?
Opinions are welcome if you have one, but I'll experiment to find out myself too.
Here's a few sites that list out the radical elements:
In Japanese:
https://kanjialive.com/214-traditional-kanji-radicals/
This doesn't have all 214 yet but here is a site that lists most of them (163) in Cantonese jyutping as well as pinyin:
http://www.cantonese.sheik.co.uk/dictionary/radicals/
(For Mandarin Chinese learners it's probably easy to find a complete list in pinyin.)
Check this out: This awesome old Qing Dynasty relic was compiled at the orders of the Qing Emperor, and was apparently the fist official orderly compilation of all the radical elements, as well as over 40,000 characters.

It's usually called the "Kangxi Dictionary" in English (using the pinyin romanized Mandarin), but in Cantonese and Japanese:
Cantonese:
康熙字典
hong1 hei1 zi6 din2
Japanese:
康熙字典
こうきじてん
koukijiten


Traditional Chinese characters have an amazing history going way back to the days of oracle bone inscriptions found in caves (where they were used in some kind of pyromantic divination magic) in pre-historic periods that are still very mysterious, and myth and legend mingle with ancient Chinese history.
Is that awesome or what?
(Answer = Yes, LOL.)

