I can empathize with your situation. My first attempt at killing a chicken left me feeling horrible because I don't think I cut the neck deep enough, meaning the chicken died, but not as quickly as I would have liked. I think the mistake I made was that I had to come to grips with the fact...
Congrats. Since you are doing them all on the same day, just be sure you have adequate space in your refridgerator to "rest" them for about 2 days after you butcher them before you stick them in your freezer. Another word of advice is for you to consider doing one or two a day or so before...
Another question I didn't see answered was whether you'd actually eat 100 birds over the course of a year and whether you have the room to store them. Idealy for me would be a out 52 chickens per year or one per week, but I don' thave the freezer space to do more than about 35, unless I have...