Being new to things can be intimidating, but is not always a particularly good reason to not try. Just keep the things you learn in the back of your mind for the next project.
Most everything I've ever built has some element of not knowing what I'm doing and I try to incorporate what I learned into next project if that makes any sense..
I remember when I first gave a go at auto body work. At that time I really had no clue and did all of the sanding by hand out in the backyard. Fast forward about 10 years and suddenly I owned an air compressor and a bunch of Hutchins Sanders and that first car I spent all summer working on would have taken an afternoon.
Don't look at mistakes as failures, but as learning experiences.
You're well on your way and the wall looks good..
I figured it's time to change my signature so hold your breath. This is it.