I'm picky about fabric. I buy a lot from estate sales, but I am picky.
I'm obsessive about pressing. Always press from the front and always so that the seams nest properly.
I'm picky about points matching. Very picky. Although on my last quilt, full of stars, I was a little less picky because my sewing buddies are always saying, "don't look at my points, they're not as good as yours." and I wanted to show that a quilt can still be gorgeous with some imperfections.