Originally Posted by Jim's Gem
I also will use a small piece of painters tape and in the center of each block I place a piece labeled for example "A-1", "A-2", B-1, B-2, etc. it helps me keep the blocks where they are supposed to be!
I do both take a picture and put a sticky note on each block saying R1 C1, R1 C2 (row and column) I think I might be a little compulsive :-)