The first and foremost important thing to remember to do, is distinguish which rows and numbers you need to work on, and which rows you may use in order to eliminate the numbers. It's really the entire backbone of this concept. Another important thing to remember to do is to calculate correctly, for if you mess up even once, you will proceed to arrive at a wrong answer. Lastly, you should check your answers with a calculator, if an answer sheet is not readily available. That is all.
