As for shot placement. I prefer either the broadside, taking out both lungs, or the shoulder when the deer is facing me at 45 degrees. BUT I'm using open, iron sights, not a scope, and I'm at 100 yards or less where I hunt. I don't like neck shots nor head shots as the deer is very prone to move those parts and a slightly less than optimal sight picture means I might not impact the spine, so the deer is going to flee and perhaps flee pretty far. Again, though I'm using iron sights.
Plan to hunt all day, especially in public hunting lands. Don't leave for lunch and come back and don't do a half-day hunt if you can avoid it, especially in damp and cold & damp weather. The deer can keep warm only one way, calories, and to get those they need to move. I've harvested about half of my deer in the past decade by staying in place on a weekday, when other guys have to leave as they only got a half-day off from work. When they leave, the deer, who have been hiding "in place" since dawn hear that, AND extra human scent drops off afterward. Some deer move off into private land and if you're there you get a shot, and some simply start to move on the public land since they need the food, and if you are there...you get a shot. A bunch of guys have told me "deer don't move from ten to near sundown", yet..., I've bagged several between 1 and 3 p.m.
Don't be a slave to every new gimmick that comes along. I like wool outer clothing, dull colors but not necessarily cammo, as
cammo is made to fool human eyes, and when I move through branches or brush, wool sounds like hair when it rubs, since it is, and it's especially quiet when you move slow [hint hint]. (Gortex and cotton canvas make unnatural sounds moving in brush).
You will do better with wool clothing and breaking up your outline with natural vegetation by standing against a tree, or up against a hedge. You can spend $400 on a suit that makes you look like a bush, but if you're the only bush in the meadow, the deer are going to wonder why there's a new bush in the meadow.
For scent, I use plain lye soap, on me and on my clothes. I don't hunt in a tree stand as the meadows and abandoned fields where I hunt don't have large enough trees on the boundaries for such, and this also gets the deer close. (My most recent deer was on Jan 6th, and it was paced off at just 33 yards) IF you're really worried about scent, build a hardwood fire at home, and then hold your outer layer in the smoke for a few seconds. Works just fine, and lasts a while. Inexpensive too. The only other thing is cover your face with a dull color bandana or scarf (if it's cold). Deer will see that light color of your face move as you scan back and forth, even if you're standing still.
Lastly, go to the range, and practice. Find a good brand of ammo that's accurate and stock up. Try shooting not just from a bench, but from odd positions. Try also putting your non-trigger-hand against a post at the range (or a tree when hunting), and lay your rifle over that wrist, or put that same hand with the palm against a tree and lay the rifle into the crook of your thumb. When you do this with a tree, you become a standing tripod, very steady, and you can make a very good shot that way. I'd estimate that the number one "problem" hunter's have is they haven't done enough range time, and it's one of the simplest to fix.
LD
