Don't worry too much about the zipper. The first one I ever used I made a concealed one, and it's honestly pretty easy. As for insane directions, I like to look at the pictures...a lot. And then I try to figure it out by holding stuff together before sewing. I definitely recommend the Built By Wendy book Sew U for learning how to do the basics, and her follow-up for working with jersey and knits. The woman makes it simple and I own them both for that reason (plus the patterns that are in the back of the book, with instructions on how to turn them into a ton of different things)
For a first project you did an amazing job. The zipper is great and the skirt fits really, really well. Oh, and time-wise, I've rarely made any piece of clothing in under 3 hours. DEFINITELY keep sewing!