I agree with Holice. Particularly with cables and handquilting, I start marking in the corners. I will do 2 (either top/bottom or sides) corners first and at least roughly see where the stencil will/won't match up and adjust accordingly. Then follow suit for the other quadrant. I will still usually begin quilting in the center of that border and might have to fudge a little but not so that it's very noticeable. I also usually mark as I go and quilt in a hoop. Sometimes it's worth marking all the borders in advance and just fill in the markings enough as you go along so you can see them. At least with it all marked you have registration marks to go by.