A changing tent is a light sealed tent that you put your hands into so that you can load and unload the film magazines. You start by placing the magazine and the unopened film canister. You then seal up the film changing tent and then stick your hands into the holes constructed for them. If you keep your hands in the slots the changing tent will remain sealed away from the light. You can then, without looking, open up the film canister, remove the film stock, load it into the magazine, close it up, and then take it out of the film changing tent so that you can finish the loading process. This is difficult to do without looking so you will have to practice on dummy film stocks and magazines over and over again until it becomes second nature to you. The best tip that can be followed for practicing loading film inside a changing tent is to load and unload the magazine over and over again while looking, then try doing it with your eyes closed. Once you have that down you can move on to the film changing tent.