I've tried it from time to time and haven't had alot of success but it's definitely worth the time. I think that as long as you don't expect to be successful every time you'll be fine as some evenings they won't gobble for nothing and then other evenings they are very vocal. I usually get out there about 1.5 to 2 hours before dark and get a vantage point where I see a long ways down a field if possible. Sit and listen as you may hear them fly up or better yet to hear them gobble. If I hear one gobbling I usually sneak over to him and figure out where I'd like to setup. I'll clear away the leaves and any brush so I can just plop down there the next morning. If they won't gobble, try the owl hoot or crow call.

I've killed two birds that flew right down to me off the roost after putting them to bed the night before. It's definitely rewarding when it happens...