I'm gonna sound like a dick, but (this is my opinion) you potentially fuck yourself over if you just study Kanji moderately/aggressively in your early days.
To start, you still don't know the basic grammar patterns, and how sentences are properly formed.
Then, you haven't got a very broad vocabulary, so you're constantly trying to learn words and remember them so you are actually learning the language and not the alphabet.
On top of that, you're trying to memorise stroke orders, and how to write each Kanji, which is likely before you have formed your own writing style with Katakana and Hiragana. How quickly can you write McDonalds, Australia, Internet, Basketball and Soccer with their correct spelling? You're likely to struggle but you might do well. Who knows.
Of those three things, your learning will benefit greatly. For a few reasons.
1. Learning grammar allows you to formulate sentences. Confidence builder because you're applying what you've learnt.
2. Learning vocab lets you further articulate yourself. Again, it's a confidence boost.
3. Handwriting is a great way to retain what you learn. As you become more fluent your writing should follow. Eventually sentence writing will become very easy.
With all those simple things to learn and build momentum, why would you spend time trying to memorise how to pronounce 日? That is just time better spent learning shit that matters.
All of that doesn't even take into account the fact that if you know 300 Kanji, it's not going to necessarily help your speaking skills - which is the entire reason we are all learning the language, right?
Edit: these are just things I wish somebody told me before I wasted 3 months on Heisig. It was 10 weeks of wasted progress. The only good 2 weeks were learning the importance of stroke order.
