I open Microsoft Word, create a table, and write 1A, 1B, 1C,... 2A, 2B, 2C,... in the spaces, enough to cover all the rows and columns in the quilt. I print that out and take it to the quilt laying on the floor. I pin all the 1's in order in the upper left corner of the first row of the quilt, continue with the 2's, etc. Pinning the number into the upper left tells me which part of the block is "up". Then I take up the pieces one by one, stacking each row in order. I just finished doing an on-point quilt this way, and it worked just as well applied in a diagonal, although there were different numbers of blocks in each row.