4 main tools that are essential to success unless your a sniper:
1) Ranger Finder--distances can be hard to judge in certain terrain.
2) Shooting Sticks--I would of had a lot more bucks on the ground if I would have hunted with shooting sticks in my younger years.
3) Binoculars with good glass that aren't to heavy around your neck.--Can make sure you don't wish you could take the bullet back when walking up to your dead deer.
4) Safari Sling-- Will keep your rifle in a position that you can quickly get on the deer, and your hands free to use binoculars, range finder, and shooting sticks.
I use a 270 bolt action rifle shooting 130 grains. I like this rifle for great knock down power and a very flat shooting gun out to 250 yards without much holdover. I will take shots up to 400 yards.
Hunt a cross wind, not directly into the wind. You will pick up more animals this way instead of them moving the same direction you are in front of you or behind you.