The fist set of OBW I had a little off, but the second set I had pretty mear perfect. If I am fussy cutting, I can always staple the fabric where I am not going to cut as well to hold it still while I am messing with it, I will try both maybe, it is not like I am short fabric or anything, and see what I get, I have seen the mirrors, and all you need to do is tape some small ones together to get what it will look like, I have a pretty good imagination so I am thinking that I can probably guess for the most part. but you never know, I might just suck at it, only time will tell. I am hoping to get the mystery quilt thing done on sun so it won't be then.