I also struggled with puckers until I started using the Fons &Porter method--2.5" binding, folded and press; start with about a 10-12" tail, miter the corners. About 10-12" before you get to where you started, stop and lock stitch. Now, lay the unsewn binding on the quilt edge and midway along the unsewn side, fold the ends so there is a 1/4" gap between the folded ends. Finger press both folds. Open and either mark where the pressed X is on both end tails, or simply match the centers of both ends folded X's so that you are sewing the binding together on the diagonal/bias. (right sides together!). Before you trim the two tails, flip your binding to check that you did not twist it--it should lay flat.