I would say that it makes a difference as to how close you plan to be to the deer. If you're bow hunting and need them in a lot closer to get a good shot, I would say all of that is a must but I like to do it all anyway... it makes for a better hunting experience. I wash my clothes in an unscented detergent that neutralizes odors, use a shampoo/body soap that does the same, and for several days ahead of time, I'll use an unscented deodorant. When I get in the area I'm hunting, I'll rub dirt/leaves/needles/grass into my face, neck and hands. Anywhere that's uncovered, really. I understand most scent comes from your neck and head, so I would recommend a hat (of course) and a neck gaiter, or at least a high collar. Good luck!