Welcome and you're sure to have a good time here.
A few things that I keep in mind when I am quilting so it doesn't drive me crazy are,
a) Enjoy the journey. Don't be in a rush for the perfect finish
b) It's only fabric...what's the worst that can happen?
c) Someone seeing the quilt doesn't know what you had planned it to look like, they are only pleased by what they see. So if things don't turn out exactly how you had planned, it really doesn't matter because the end result is still beautiful, although perhaps different than what you had envisioned.
d) Sometimes, things just don't turn out. No shame in learning from them and walking away, IMO.
Watson