Preparation:
Practice and Set-up- Become Proficient and confident in your archery weapon. No matter who the manufacturer of the bow, arrow, broadheads,release, etc. is
Scouting- Know where the deer are and what their patterns are.
Comfort- Ready for long days in the stand and whatever weather you encounter.
Range- Know the range of landmarks from your stand.

Besides the above....
Persistance and Patience are very important, without these you will never be consistently successful.
Ability to adapt as the deer's patterns change and hunting pressure changes.
Your stance will differ greatly when in a stand compared to a range due to obstacles like leaves, twigs, other animals. Your mental checklist should remain the same but body position often changes.