My biggest hurtle is slowing my brain down. While I am sewing on one, my mind is already thinking one, two or three ahead.
Another is catching up with my scraps. I hate cutting and I know I won't use them if I don't have them cut to a usable size (for me 2 1/2" sqs. or strips, or 5" sqs. if smaller than 1/8 yd.) and color coded. I don't like pawing through clutter to find that perfect color or print. Call me OCD, ha, ha.
Sewing for me. I always get "side tracked" with gifts, people in need, etc. but mine never seem to get done or quilted. My choice, so not really complaining either. They will get done eventually.