A great percentage of sport climbing accidents happen after the climber reachs the anchor. Next to belayer miscommunication not having a system is the next killer.
This is not a replacement for pro instruction. See part 2 same thing from a diffrent angle. Remember one mistake and it is big pancake! What I am saying is that you have to get this right. There is no room for error. Also check out part 2 which is the same thing but I think it is worth repeating.