If you watch 'Confessions'...I don't know if you have it...Brian talks about the dragging clubhead takeaway and performs it all throughout the video- pretty much whenever he hits a shot.
"Brush the grass back and chop it off at the roots", he says. See how it adds some momentum to that backswing, to that club?
Remember how he talks about the shaft stressing at the top of the backswing in the change of directions too? This is from the momentum on the backswing (the club actually stresses at the start of the takeaway too- with a 'dragging clubhead takeaway'- the more the shaft stresses on the backswing the better, I think is what Brian said in his video). Anyway- this momemtum-
this is what should turn your left wrist/left palm/clubface to the inclined plane (the pane of glass, if you will) and cock your right elbow...the cocking of the elbow is what then bends your right wrist straight back and flattens the left. Momentum does it.
This is setting 'Impact hands'.
Now that your left wrist has turned to the plane (the proper plane- on plane) your startup swivel is done- that's all you have to turn your wrist in the backswing.
***This is called fanning, and is for SWINGERS (this is the 'startup swivel' you might have heard about). Basically hold both hands out in front of you, palm to palm, thumbs up. Leave your left hand where it is- clap your right hand with your left, your left hand and forearm swinging on an arc like a door on a hinge. This is fanning. Note how you can only fan it about 45 degrees. 1/4 turn. See?
Your hands are set. You let your hands finish their ride with momentum to the top.
Anyway, that's what you want basically. That's the jist of what a swinger's takeaway is like "ideally" and where the hands/club go...this is all simplified...and remember no new move is so easy to get used to...but you do need to understand it first.
I don't want to say the downswing takes care of itself now, cause it doesn't. I'm still working on this. It's hard not to think "K so now that I'm good to the top...it should be a pice of cake to get down to the ball." Might not be tho. New moves on the way back, new moves on the way down.
OK, enough for now...heh. Hope that helps ya. Might be information overload, but hey I don't like to stop once I get goin'. [8D]
P.S. You have to really let it go with momentum on the backswing once you know it and can trust it to do so. That's where all that effortless power comes from. Club merely floats in the hands.