When I first got into turkey hunting 6-7 years ago I used a box call because of the ease of use. Since then I feel I've become a competent caller with it, but problems arise in the "end game" I guess I would call it. Any tips for how to call when a tom is in close, or in sight, but not in range yet without spooking him?

My friend who got me into hunting uses mouth calls, and I've tried them, but can't seem to get past the gag reflex. I'm thinking about buying one and just keeping it in every waking hour to get past it. Is that my only option?