Mostly depends on how high you are. If you're on the ground and the deer is at 26 yards, obviously gap shoot the deer, between your 20 and 30 yard pins. If you're 25' up a tree and the deer is 26 yards from the base of your tree, you do the same, although in reality, the deer is actually closer to 30 yards away from you in that instance, BUT you shoot it for the actual distance, not the percieved distance!
Sounds like you need to do some practicing from a tree stand. This would help you build some confidence shooting from a raised platform!