Good advice.

I always try to move the camera into position the moment I see the deer,if you are high enough in the tree the deer should not spot you if you move slowly and deliberatly.I always move the camera, even if I feel I will get busted, because without being on camera the deer is going to get a pass anyway. Sometimes you gotta take a risk and hope it works, if it doesn't , move set ups the next time and try again