I wonder how this applies to personal projects. I find it hard to motivate myself to just "study a textbook". I do do so, but it almost always feels useless compared to actually doing something. It doesn't have to be grand, but it needs to be something I can at least "trick" myself into believing it's useful.

Well, right now, I'm pretty happy and have a personal project that I'm very eager to have done and polished and see the result of. Hopefully life keeps throwing more of them at me. It's been a constant issue for me though.