Well, use of fall
safety gear is no small matter, and a harness is only part of a
system. I don't think that there are many people on the boards here who will tell you how you should use your
safety systems because we don't want to be accountable in any way if you were to get hurt taking our advice. This is the same reason why if you go into an outdoors store to buy a climbing harness they won't tell you how to put it on when you try it on.
In general your fall
safety system should consist of 4 basic things:
1) Some kind of connection to a structural member of your building, this can be a
safety line that runs the length of your
catwalk that you clip onto, or
clipping on to a structural member with the appropriate equipment.
2) Your harness. For
safety work generally this should be a full body harness which is rated for fall arrest.
3) A tether from your harness to the
safety line or structural member. Usually this wants to be a decelerator.
4) You and common sense. Even with
safety gear you should not do anything that doesn't feel comfortable, or that doesn't seem safe. The best
safety gear is the gear that never ends up being used.
I will not tell you how to use or setup any of this equipment for the reasons that I stated before.