Are you doing needle turn or the preturn method? I needle turn and use 1/8 to 1/16 inch seam allowances. If the pieces are small I cut out 1/4 to 3/8 in seam allowance, pin or tack it in place and trim the piece as I turn under the edges. As other have said, it takes practice. If you are doing the preturn method, I'm not much help. I've tried but I seem to be all thumbs. I have read but haven't tried that if you mark the turn edge of your applique piece with a hera marker, it's easier to turn. (Just run the hera marker around the template.)