It Can Work...
I agree with Eastwood - it's not easy, but I've hunted them successfully before on my own.
Walk slowly like he said, and stop often (sometimes abruptly) - that gets them spooked and they sometimes flush. Also (as long as you'd be shooting in a safe direction), work a zigzag pattern toward an obstacle (field corner, fenceline, etc) to get the effect of cornering them and making them flush. Doesn't always work, but does sometimes.
One last thing - when hunting them on your own, be ready to put your safety on and RUN to the bird when it starts to drop. As you probably know, often with pheasants when they hit the ground the fun is only beginning!
Good luck, let us know how it goes.
Michael