A probability of spot and stalk to work will heavily depend on the terrain that you're hunting. If the pastures are flat as far as the eye can see with 4" tall grass, then obvisouly you'll be up against a brick wall. But if there are some cuts/diches and some scatter sage brush and some descent hills around, then it's a descent possibility. I killed a doe last year and a buck the year before by spot and stalk. I simply glassed and tried to find animals that were by themselves, waited for them to bed dowm, and went after them. One thing you will quickly learn is how good they are arout laying with the wind coming from behind them so they can see what they can't smell, and smell what they can't see. Be preparred for longer shots than the average whitetail hunt ends up with. Carry lots of water. In my area, knee pads and forearm/elbow pads are a must.
Here's the buck that I got two years ago. You can see my arm/elbow pads and knee pads that I used. I made my arm pads out of some thick felt that I have. They worked awesome, and I used them again last year and I got a doe last year.