I've met people who went right from the gun shop to the deer stand.
Scary as hell.
As far as "off hand" vs. "bench" goes, there shouldn't be much of a difference in your group size from one to the other. If there is then you are definitely spending too much time doing one and not enough time doing the other.
I was taught to practice like you plan to hunt.
I rarely bench a hand gun for sighting in, but I'm probably the exception to the norm.
When squirrel hunting with a muzzleloader, I look for anything I can to steady my shot so I can shoot them in the head if possible, Probably half or more of my shots are made without a rest because I'm usually walking.
Taking time to find a rest often gives away your position and spoils the shot.
You need to be able to do both or you hunt with a self-imposed handicap.