I've never done that. I work very hard to keep my quilts very square as I am quilting them, (I use my vertical and horizontal channel locks alot, and also a longarm centering tape sewn onto each leader and another suspended overtop ) so that very little needs trimmed off when they are "squared up" after the quilting is finished. I think most la'ers do the same. I would certainly not do that for a customer quilt, unless I was specifically asked to block it and I would be the person binding it, too.
Congratulations on your new machine!
Have fun with it!
