Yes you can harvest deer by doing all the above especially during gun season, however if you archery hunt and want deer consistently to come within 20-30yds scent control is important. It is also important depending on the areas hunted. Mature deer are very Leary of different smells, and may not spook but will walk around a given area and all you see is them at a distant . That's why using wind direction, up and down drafts are important when choosing hunting locations.