You need to learn woodsmanship first. Learn to move through the woods quietly. I can't believe how many people I've heard/seen that sound like an elephant coming through the woods.
I agree this is important. Getting in place without the deer knowing you're there is key. FWIW, this is also number one reason I made the switch to saddle hunting. No matter how carefully I tried I couldn't keep the brush from rattling off the climber as I walked to a spot in the morning.
I also think being mobile and changing up your spots is key. Deer will pattern you quickly if you're repeating your setups. I learned this early on in my hunting career sitting over bait. The deer would approach the area and actually look into the tree my stand was in to see if I was there before approaching the bait.
The positional changes I'm referring to could be as subtle as repositioning over a couple of trees or sitting at different times to more drastic as changing hunting areas altogether. Personally I try to never sit in the same 5-10 acre spot within any given 2 day period. I also will change up trees inside those 5-10 acres chunks whenever I do go back in there as much as possible. When I head out for a hunt I generally have an idea of an area I want to target given the conditions, but rarely do I have a specific tree in mind. I'll make that decision based in the specific conditions at the time I get there. During the course of 80 sits last year I only repeated in 4 trees, 2 of those I sat in twice, one I sat in three times and one (a hot spot with little other options) I sat in four times.
Also, the best advice has already been given,
don't let the pressure to harvest something take away from the enjoyment of the hunt. I've been bow hunting whitetails over 45 years and that would be my number one piece of advice. Enjoy it. Treat every hunt as a learning experience. There's no better way to learn about whitetail behavior than bow hunting up close and personal. I still feel like I learn something new with every hunt.