I'm not a 'pro' at paper piecing, but I have just finished a Jane Stickle quilt, so I've had quite a bit of practice. I agree with all the others that recommend larger than you would think pieces, then trim.
What I wanted to add was that if I wasn't sure whether I was going to get it to flip in the right direction (triangles are confusing sometimes) then I sewed a piece into place with the largest stitch my machine would make. If it was wrong, they came out easily, and if it was right, I just sewed over, with smaller stitches. And when I say smaller, I used smaller than default stitch length, because it's easier to tear and remove the paper afterwards.