I was brought up that if you’re going to do art/craft it had to be perfect. This is of course impossible so I never completed anything. Fast forward 30 years and I’ve lesrned to overcome this stumbling block.
For me, my rules for myself are:
Only buy 1-2 projects at a time. Always buy at least 1/4 to 1/2 yard extra in case the store cut fabric wrong or I miscalculated. (Can always add to stash)
Don’t buy just to build a stash. I learned this lesson from my knitting days.
When I get piecing done, I can start designing next project but no buying until quilting is almost finished on current works.
I’m fairly new to quilting but this was my rule with other crafts also... Each new project must have something new for me to learn.
Most important: Splurge for the good tools! It makes a huge difference!