As I learned it, and it works for me pretty well:
Spot your roll in/roll out point on the horizon. Power to full as you roll in, don't forget rudder, set bank angle and aft elevator, check roll @ required horizon, then forget the AH, pick the cowl/horizon point/angle and keep it there. Don't follow the hills on the horizon! The only instrument I keep half an eye on is the VSI, but if you've got a nice flat horizon like an ocean, if your picture changes, you'll know what's happening before the VSI tells you.