It's gonna be windy. It could be snowy, or 70 degrees. Bring clothing for both.
You need to zero at 200 yards and practice shots out to 300+. It's not at all unusual to have to take much longer shots than you're used to.
Shoot paper after you get there. Your shots will be off due to elevation and atmospheric changes.
Bring a good 400+ yard range finder. Know your balistics.
Do you know where you're hunting? (Private? State? BLM?, etc) Go to:
http://gf.state.wy.us/wildlife/access/plpw/huntingwalk/campbell/campbell2.asp
Shows an area open to antelope called a Walk-In area. It is private land that is open to public. It means WALK-IN only.
Get game skinned, washed, and cooled down A.S.A.P. after harvesting.
What guns are you using?
If you want a "trophy", pick a lope with horns at least twice as long as the ears not including the curl. And go for mass by looking for large cutters (prongs). The width on Antelope does not score like deer, elk, etc.
Be patient. They are everywhere.