Just follow the directions and make sure the stand is tight on the tree. Then check it every time you hunt, before you hunt I should say.
As for the safety harness... I still use the basic harness that comes with the stands. It works well for me, I don't find them hard to put on. My brother in law hate them, says they are confusing and hard to put on. We are going in as a group to buy him one of the vest style harnesses this year. Tired of thinking I am going to have to lead the ambulance to him after he falls and breaks his a$$.
There can be a lot more involved. Ascending /descending systems, prussic knots, etc, etc. I won't go there as I know nothing of them. I am sure someone can help us out shortly! [:)]
Here is link to the Treestand Manufacturers Association's website.
http://www.tmastands.com/ On the right side, the tree stand safety interactive course would give you a good introduction.
I would say two things... learn your safety system and use it EVERYTIME and practice, practice practice shooting from the elevated position. Stay safe and Happy Hunting!
Aim for the center of the target... the center of an aspirin is the same size as the center of a basketball. The difference is mental.
John in Michigan.