I disagree with the "don't worry about it" attitude I see posted here. I am nuts when it comes to preparing to kill deer, maybe that's why I think you are getting bad advice. Example: Muzzy is a great broadhead, but it won't fly worth a crap if your bow is not properly tuned. You cannot tune it well enough via paper to KNOW your broadheads will impact the same as fieldpoints. You need to shoot whatever heads you choose before hunting. Additionally, you need to practice. Just because you shot well two months ago does not mean you will when dealing with flesh and blood. Find enough time to shoot a few arrows...I shoot nearly everyday of the year. I've gotten pretty decent over the years, and above average when I pay attention. However, superior accuracy on the target range hasn't been a focus for years...my hunting shots don't need to all be an 11, I just need all of my hunting shots to be a 10 and to happen without having to think about every detail like pin-float and how level my bow is...I want it level automatically, a quick check to confirm vs. fighting to keep it level, etc.
You are dealing with living animals. For the sake of the animal and the sport itself, do your part. The first step in doing that IMO, would be to get with Milo as he suggested. I know him, he knows bows and broadheads. You couldn't ask for a better mentor to aid you. Let him fine tune your set-up, a few tweaks from someone with experience is invaluable to a new bow hunter, take advantage of his offer. If that isn't in the cards for whatever reason, do your part by getting a little range time...and buy mechanical heads! They will fly like a field point, at least much closer than a muzzy without extra tuning of form or bow. You don't need anything too fancy. The recent trend is to knock on the heads that use a rubberband to hold in the blades...however, I think they are perfect for deer. They won't deploy early, and they will open EVERY time. The slight energy loss due to opening is not an issue on deer sized critters... Use them!
Keep your shots reasonable. Relaxed animals, at a good angle, die quickly. You don't want your first to turn into a nightmare because your tried to force a shot that wasn't there. I usually draw my bow while reminding myself that I am not going to get the shot, just trying to be prepared. Then, when things are perfect the arrow is gone and the critter is dead. It works for me, I've only lost animals when I tried to push for a perfect shot instead of waiting for it to happen. You can't force things to go your way when trying to kill with a bow...so don't try it. The time pushing issues is on the practice range...
Good luck