I undertand pretty much how to advance quilt and position it for next row with groovy board, when there are positioning marks on the board. But are there any good tips on what to do when there are no positionng marks? I didn't quite understand the dvd on this point. I am new to this, and have been very pleased with the progress I have made learning how to use everything, but I seem to be stuck on this question. Maybe my brain has short circuited... : )