For whitetails, I am certainly not much of a ground hunter. Mostly because I prefer to be in a tree stand but I did learn a few things last season while doing more ground hunting that really made all the difference in the world. For one, as opposed to using 3 legged stool, I would rather have a seat that you strap on to the tree. I put mine up high enough so that I am kind of half sitting, half standing. Picture the front swivel seat in a bass boat. The reason is this gives me a little better visibility, and it also allows me to shoot standing up which I prefer. Also it helps if I need to shift position a little. I wear a ghillie suit too and I am convinced that deer do not notice your profile as much if you are in a ghillie suit and are standing up with legs together with your back up to a tree. They often do notice me if I am sitting on a stool looking like a blob.
Also, I found that dark face paint helps a lot. I buy the cheap stuff that little kids use for Halloween. I COMPLETELY cover my face with it, leaving no white exposed skin at all. Including my eyelids ears and lips. I don't like to wear gloves while bowhunting in the early season so I also completely cover my hands with this stuff. When I am done I have zero exposed skin. I wear the excellent ghillie suit that Marc Anthony designed and I DO wear the hood. I think this really helps.
Even doing all of this, I prefer to have a pre-built groundblind made of natural materials but I killed my deer last year without doing so. I just carry some twine in my pocket and some ratchet pruners. Tie the twine around few trees above the waist but below the shoulders. Cut some natural vegetation and hang it on the twine.
Getting drawn is the hardest part, and this again goes back to why I prefer the strap on seat in the half standing half sitting position. When the deer comes, it takes very little movement to be completely standing. This again gives me a narrow profile with the tree behind me for background cover. My Ghillie suit is made of mesh so before the deer gets to me I can stick the bottom bow limb in one of the holes in the mesh on the inside of my left leg. This way I have the bow up and nearly ready. While the deer is walking it is a matter of raising the bow up just a little more while drawing at the same time just before he steps in my lane. This is exactly how my hunt played out last year and I shot him from about 8 yards. He never had a clue I was there.
Again, I have taken few deer from the ground...but that is mostly due to the fact that I rarely hunt from the ground. A lot of the little tips I just shared came from my buddy who has killed the majority of his bucks on the ground with his recurve. These are things he taught me and they do work. On one fine weekend in November he killed 2 P&Y bucks in 3 days using these tactics. Both shots for him were under 10 yards!