Get there before dusk and camp out for a while. Watch the deer and see where they enter the field. You'll probably find that the deer have a prefered enterance and exit. Note these and sneek in durring the midday when the deer are likely not arround. Try to track them back 150 to 200 yards from the edge of the field. Look for funnels or other terraine features that bring the deer together. You get the idea, set up here and keep the wind in mind.

Put a little time in and I think you should be quite successful.
Good luck