Is there any special way to use one of these things? - Is your front sight round also? If so, line the round peep sight around the round housing of the front sight, leaving just your pins in middle. This is why have a good anchor point (the same place every time) is so important.

Second question, do I REALLY REALLY need a release to get good enough to shoot deer? I seem to remember being fairly accurate just using my fingers. - There are some people out that can shoot really well with fingers. However, most people see improved accuracy with a release aid. Start shooting now with fingers, if you are not happy with your accuracy then purchase a release and learn to shoot it.

Third question, where is the best deal on carbon arrows? Cabelas has some for 54 per dozen. - That seems like a pretty good price. Just be sure that you get the correct spine for your DW and DL.

Fourth question, if I use a 100 grain field tip to practice and a 100 grain broad head to hunt, do I need to worry about being off much? - It really depends on what BH you end up shooting. Mechanicals are noted for flying like a FT. There are some fixed blade BH that say they will fly like a FT. I always practice with whatever BH I plan on hunting with before I go into the field. Almost all of the BH's on the market today will either have a practice head, practice blades or replacement blades. I would suggest you practice right now with FT's, decide later on which BH you will shoot and then practice with them when season is closer.