Oh - If you are making odd shapes, try precutting the pieces. Make an extra copy of the design to cut apart to make oversized fabric cutting templates. Here is a link to a tutorial on it...
http://crazymomquilts.blogspot.com/2...r-piecing.html
I have been doing a lot of paper piecing - and a lot of ripping out because I use a piece of fabric that I *think* will work and it doesn't or I didn't have the angle right..... I think precutting will save a lot of headaches.
