Yes, it is a good idea to make one sample block, then check carefully with the clue to make sure your unfinished size matches with the unfinished size given in the clue and that your finished size matches the finished size specified. I think Bonnie gives both in most clues. It is easy to get confused when using a method other than the one Bonnie gives. I find it especially important when using the dies because some of dies give the unfinished size and some give the finished size. Now, I do have some very old dies and I do not know if this issue has been eliminated with the newer ones.