I am an absolute beginner at writing kanji. If you don’t practice it, you won’t be able to do it. However, I think WK lays down a good foundation - if you can learn how to write radicals, you’ll be able to write a significant amount of kanji.
I’d recommend this for learning to write (and learning vocab as well):
Writing is not something I’ve focused on because I’d rather spend the time improving my (very poor) grammar and listening/speaking skills…