Maybe you have a friend who is an excellent seamstress, or a Grandmother who would love to share some of her knowledge with you, odds are that you know someone who can help you learn.
I learned techniques that I would never have figured out on my own, plus there is the added bonus that you FINISH the project during the class, so it doesn’t get thrown in the “someday” pile.
If you get to the point in a project where you are sewing sloppily or find yourself saying “good enough” more than a few times, walk away. Put it down and go do something else.