I, too, do machine binding. IMHO the trick is to sew the binding onto the front, then PRESS it well, pushing the binding outward from the quilt, and using the point of the iron to push into those mitered corners. Once the pressing is done, I use those binding clips (aka hair clips) to hold the binding in place. I start in the middle of one side, and place clips down that side, around the corner and halfway down the adjacent side. I use my thumb and index fingers to get the correct 45 degree angle in the corner and put a clip on to hold it there. Then I stitch in the ditch on the front side. The reason I do only a portion of the quilt at a time is because the clips tend to fall off if you try to do the entire quilt. I started out with 2 1/2" binding as most books suggest. Once I became proficient with machine binding I cut the binding width down to 2 1/4" because I don't like the look of a wide "flap" on the edge of my binding. Here is my suggestion: make some placemats and practice on those. That way you won't feel you have ruined a quilt if your bindings aren't perfect at first. Good luck!