Before starting any experiment, you should understand the entire procedure that you will be following. You need to make sure that you have the proper equipment, and that you know how to use it.

When you are trying an unfamiliar procedure for the first time, it is a good idea to practice at least one "dry run" without chemicals. That way, you can make sure you have all the materials you will need at hand, and that your workflow will proceed smoothly. You will greatly reduce the risk of an accident by carefully planning ahead.