When I first started quilting about 4 years ago, I had a TERRIBLE time with my binding. But the old "practice makes perfect" is so true. I can do a beautiful machine binding now. You will prevent wavy edges if you measure through the center of the quilt or even in from the edge several inches, cut your strips that length. I don't pin my binding at all, at any point. I used to glue baste when I rolled it to the front, but have now found I don't even need to do that. The handy dandy steam iron makes a wonderful crease, I press the corners well, and use the blanket stitch nice and small. Nearly all my quilts are charity quilts so they need to be bound by machine.