I number my rows (post-it notes).....after that I put a pin in the first block of the first row......I press to the side where the pin is.
The second row has number two on it, I put a pin in the last block, I press to the side where the pin is.....
That way the seems in the rows will go together perfect!!
I do the numbering and the pins when I lay my blocks out.

This way I keep track of what I am doing......

Do I make sense..........