how do you handle learning new things? any tips?

I'm trying to teach myself to use the godot engine to create a game, and god is it hard to concentrate. I don't really know how to begin, even after following the tutorial, and I'm second guessing myself constantly about what step I should take to make progress or even broaden my knowledge and understanding, and it's a constant battle to resist just starting up some game or other, to do anything except actually work on this.