If you’re into scripts, there’s a script for that:
Otherwise, I like popping kanji I get confused with each other into Anki. Sometimes it takes a few wrong reviews to figure out which kanji I’m confusing for the other, but once I figure it out, they both go into Anki, along with a few other similar looking ones if I’m feeling sassy.
And I third handwriting the kanji. If you don’t want to waste paper, just do it in Paint or some other free drawing program. You’re not going for beautiful handwriting but nailing down the details.
It’s good that you’re getting this figured out now, it only gets worse later. 