Loading a snare is so important to having the snare work for you in the woods. Most snares are NOT loaded and cause the animal to have to pull the loop down. A loaded snare will jump (close) down on the animal when they bump the bottom of the snare loop with their chest.
If you are new to this, always keep the cable in its natural memory. If you load the cable sideways, the snare will not work very well or at all. Also you have to know what the snare is built for. A 14 inch coyote snare needs to be loaded different from a 7 inch raccoon snare. The loading procedure should only be used on 1/3 of the intended loop size. If you have never done this before, go slow and push gently as you load the snare. You do not want to over-load the snare because you added to much pressure to the cable. Take your time, after a few snares, you will get the feel for how much pressure you will need to apply.
The best way to learn is to do. You will probably screw a few snares up, so what. Learn from this, all education cost something. Messing up a few snares is cheap in the advantage you will have out on your fur or animal control line.