Sometimes challenging yourself or trying something new. Even if you fail at it, at least you learned what not to do next time.
That's what I always do. Forcing myself to do something out of my comfort zone because if I truly want to learn, I need to do it myself and learn the mistakes to become better.
But if there are things that you don't even understand, I do suggest taking sewing classes or ask people you know who does know how to sew to give you pointers.