Great stuff here....remember to stay in the shadow..nothing points you out like the sun shining on you.
I try to make sure I am not oriented in such a way that the approaching deer are ever looking at me...and I never draw my bow or move at all until they put their heads down to feed, or turn away to look at something.
Depending on your location you may also think about digging a pit blind. Dig down so when you sit in the blind you have just enough room to shoot but you hide most of your body...
You will be close to deer who do not know you are there. It is the greatest rush ever.
Do not move until you are ready to shoot.
Consider adding a leafy suit to break up your outline and blend in with the background.
Make sure there is nothing under your feet that will make noise if you have to turn to shoot.
When you're this close everything matters. I even had my metal coffee cup coated in a camo pattern....
If you're downwind you dont need to worry about scent control.
Orient your site to the extent possible so when the deer arrive in front of you they are not facing you..or facing away from you....no shot.
There is also a tendency to end up TOO close, and now you can't shoot at all...cause holy crap...you never thought about having 4 deer in front of you at once but here they are...and you won't be able to fool all those eyes very easily...unless they're facing away.
Good luck...once you're successful hunting this way you may not ever hunt any other way again...