RE: How close is to close to a roosted bird?
I have gotten in bewteen hens and a Tom a few times. Once with success.
My best advice is - do you know wehre this birds likes to fly down too? That is where I would sneaks too very early and then say nothing.
That is IMO - Ninja turkey hunting. He flies down - Bang!
I have also scattered hens with limited success. It can cause the Tom to fly if he is roosted too close.
JW