I used to do the paper thing also but even that got me confused at times. What I do now is take a Sharpie or pen and mark on the seamline on the back of each block. Row one would be 1-1, 1-2, 1-3, etc. Row 2 is 2-1, 2-2, 2,3. And if there is a definite direction I out an arrow pointing which way is up. It takes less time than cutting little pieces of paper or using the pins which can become cumbersome and sometimes fall out.