Buy some snap caps and practice dry firing your rifle at home for 15 minutes every day. It's free and it will do more to improve your shooting than anything else. Tape up some deer photos on the wall and practice shouldering your rifle as you take the safety off, exhale, aim, squeeze, follow through and repeat. Always repeat. Make sure all your screws are tight on your scope mounts and rifle action. Don't move if the deer is looking in your direction. Before you pull the trigger say, "Sit Toto", (in your head, not out loud) and then anchor him in his tracks. One fellow we hunt with swears by this. Luck is a huge part of hunting but more time in the bush equals more luck. So put in the time. Hunt where there are deer. My dad hunted hard this year and spent hours in his stand in a spot that looked really good but where there was no deer sign, a complete waste of time. If you don't have lots of sign where you are, start putting on the miles until you find some. If you're specifically hunting bucks, then look for scrapes and rubs. Buy a good compass because your life depends on it and attach it to your pants, not your coat. You might end up throwing your coat in the truck because it's too warm out and then be stuck without a compass. Buy a good GPS and learn how to use it before the hunt. And buy 2 good quality headlamps because your life will also depend on those, when it gets dark. Try and travel as light as possible. For years a I lugged a backpack with me through the bush but this year a scaled back on everything. I carry a couple of feet of decoy string for tying off the anus (always do that by the way), a light weight folding knife (Outdoor's Edge Razor Blaze, highly recommended), a lighter and zip firestarter in a ziploc bag, just in case. And then some toilet paper and a couple of bottles of water. When you're walking, every ounce counts. Dress in layers, too so you can adjust to the conditions.
Another suggestions would be to plan to shoot something. Expect that you will be successful and have a plan for what to do once that happens. Once you've dropped a 300 lb whitetail, 2 kilometers from your truck in mild weather, you need to have a plan that you can execute immediately or you're going to lose the animal. I have a game processing pack/kit made up with a meat saw, several sharp knives, sharpening steel, block and tackle, gambrel, rope, game bags, rubber gloves and baby wipes for cleaning up, a small tarp or sheet of plastic. You're going to need to field dress and possibly skin and quarter this animal by yourself. It would be a good idea to know how to do this ahead of time. Maybe print some instructions on it and put them in a ziploc bag to go into your pack. If you need to quarter the animal, you're going to want to get the quarters hung up to start cooling right away. It might take you a full day or even two to get this animal packed out. It would be really nice to have at least one friend to help you. If you are going to be hunting with someone else, make sure you have an extra pack for them to pack out meat as well. Time is of the essence. Once you get it back to your truck, head for the butcher shop immediately and get it hung up in a meat locker. It's also a good idea to know where you're going to bring it and to have an after hours phone number all figured out ahead of time. You don't want to have a dead animal in the back of your truck on a Sunday morning with temperatures starting to climb and you can't reach anyone to open up the meat locker. If you're properly prepared and in good physical shape, it's a lot of really hard work. If you're out of shape and not prepared, you'll have a disaster on your hands.
And remember, you're on vacation so make sure you have fun. If you don't feel like sitting in your stand all day long in crummy weather, then don't. Go back to camp and pour a drink, play cards with the boys, have a sauna and enjoy yourself. There are more important things in life than just killing a deer. It never bothers me if some of the guys want to stay back in camp for an afternoon. Having fun is the most important part about it. But if your idea of fun involves killing a deer, you will need to put in the time in the bush.
Good luck!
SS1