If a deer even suspects that something is amiss, it is heading for the next time zone at warp speed. Scout the area that you plan to hunt. don't stink up the area with perfumed soaps and aftershave. The list goes on. They can see and hear you a mile away and smell you further. Sit on a ridge sometime, and watch other "hunters". They are pushing the deer ahead of them, not intentionally. The deer then circle back behind them to where they origionally were, and they never saw them. As stated, there is a lot of good info on this site and others, if you want to look.