When you're on a sit at an ambush spot... don't even bother turning your head in the direction the wind is blowing. Don't even bother. Try to first look to the sides with just your eyes. Even better, learn to pay attention to what you hear so you're not moving so darn much
Unfortunately though... once you start needing stronger and stronger glasses... you then *have* to look thru the glass to see anything well at all, so unfortunately now I have to move my head more than before. But just think to yourself "Ninja Slow". LIke... turning your head 90 degrees to look to your side... it should take you like about 9 seconds to do it slow enough. It's a trip what you can get away with in terms of movement, as long as you are sitting in the shadows... and you move imperceptibly slow. And if they are in your FOV when you're moving... keep your eyes on them, watch their body language! You can tell when they've seen you moving. But with the concealment gear on... as long as you are good at playing the freeze game... and don't proceed to move again until you see their body language change back to relaxed and they put their head back down or turn to look the other way, or as they meander a tree comes between their eyes and you. Then you can move a bit. But as soon as their eye comes out the other side of that tree, the freeze game again. As long as you learn how to play the freeze game well... you'll have some amazing experiences out there!
RE: Noise - Once you get to a spot where you're going to sit, don't be dumb! Think ahead! Get out any thing you think you might want to reach for or need! Take off that bino harness and set those binos down at your side, besides the water bladder in the pack, I always take another water bag with a fliptop drinking spout. And I can open that thing silently. Put your pack down such that it helps to block your feet from their view. Close enough that you can rest your rifle or bow on it, but not soo close that it will be in your way if you need roll onto your knees to get out of a low seat, or not too close that you can't fit your shooting sticks in front of you.
Go out to the spot ahead of time and build a ground blind with deadfall or trail-cleared branches they leave around sometimes.
And learn about HOW LONG you can remain in the shadow at the spot you choose. When you move and you are not in the shadow and you don't have stuff behind you that breaks up your outline in conjunction with your concealment gear... your movement sticks out SO BAD.
For a sit spot... make sure you actually either sit down at that spot for a second... or stoop over and dip your head down to the eye-level you'd be at when seated.. and take a moment to look around your FOV. Are there branches in the way that would be easy to snap-off? You don't always want to snap them off either sometimes those hanging deadfall branches help to further conceal you from their view... but you just have to be ready and wait until they pass from behind them into a more open spot beside it before you take your shot.