Practicing with a slate call wouldbe a good start (I have a Primos)
Also trying out mouth calls would be a good idea too, because when that bird gets close your not gonna have a chance to put down a slate call and pick up your bow...

Mouth calls are a little more difficult, but thats nothing practice wont solve

The best thing to do is just try out a few different kinds and find out what your comfortable with...that will give you more confidence as that tom is makin a be line for ya!!!