I like to number them for keeping rows in the correct order. I use a fine sharpie marker an number 1, 2, 3, etc. Then put pin 1 on the first block of the first row, 2 pin at the beginning of the 2nd row, etc. Keeps me from getting my rows mixed up and having to 'unsew'. I know you can buy them already numbered and some come with arrows but this is cheaper.