I have the same problem. What I really hate is when I decide on a quilting pattern, and then halfway through the quilt, i think of a better or faster design. Now what!!!! It's too uch to pick out and i have to force myself to finish it. I am kind of in that place right now with a lighthouse quilt. Luckily, it is large blocks so I make myself do at least a block at a time. My goal is to have it finished by Memorial Day. It's been 4 years since I bought the fabric and it goes on my bed at the lake house. I took it up there and don't take other quilting projects, so if I have to quilt- i have ot work on it.
Back to the design thing, i. Think it takes time to learn what looks good with certain patterns.