i usually put the borders on the bottom to keep them from stretching. isn't it a hoot how different methods work for some quilters but create disaster for others?
i also never try to measure my borders precisely. i always make them extra long and then trim to size after they're stitched on. it adds to my scraps bin and i don't end up tearing my hair out. (at my age, i'm afraid it wouldn't grow back! :lol: )