If you're going to shoot a fixed blade head you DEFINATELY want to shoot them before hunting. Broadheads can and often do cause eratic flight. You may well find they shoot the same or you may find they consistently shoot low 5" and to the left 3-5". The truth of the matter is you won't know until you shot them and if you're going that far you might as well group tune with your broadheads. It's actually pretty easy. If you don't have to tuning guide then down load it and print it and it'll walk you through the process.

http://www.eastonarchery.com/downloa...ning_guide.zip

Don't be intimidated, it is not difficult it is simply a process.

Good luck and please, ejoy the "tinkering" that comes with bow hunting
If you shoot mechanicals you can often get away with less tuning because the heads are less likely to plane and more likely to fly like field points. Unfortunately I think some bow hunters use them as a crutch and instead of tuning they throw on mechanicals and are ready to go. The problem with that is a bow and arrow or either component that is out of tune will result in lost energy and that can casue poor penetration.

Bottom line IMO is just take the time to tune the set up you plan to hunt with. The best part is if you have troubles with the process you can post here and someone will be able to help you through it.