Learn to spot from a distance. Good optics are a must. Let them bed.
Examine the terrain, and get good land marks. Hills, rocks, and brush look different when you see them from a new angle. Use it to your advantage.
Decide if it's worth trying. Sometimes you should pass on a good deer because he is in a spot where you'll spook him, then he'll be harder to find.
Check the wind.
Expect them to move after you leave sight of them.
Slow down
Recheck wind and slow down again.
Use your optics as you start to crest hill tops, did I mention slow down.
Some people remove their boots the last 100yds or so. Get a heavy pair of socks to stock in
SLOW DOWN
Patients is the key to closing the gap. Check the wind.
After you get in bow range you might have to sit and wait for some time so don't forget to get a little comfortable when you stop.
Just a few tips, there are more, but sometimes experience is a good teacher.