Actually, what I do when mixing drums, and this may not work for everyone, but it's the way I do it. I start with the faders up and then I listen to the song dry, no fx. As I am listening to the song I am tweaking levels into the ballpark bringing everything into the mix just to get a feel of how everything can work together. By the time the song is over(usually) I have the levels close to where they need to be. Next I mute everything but the OH's pan those hard left and right. I create a bus for the OH's and start to add any corrective eq, gating, compression and tone shaping eq. Once I have the drums sounding the best I can get them with just the OH's I bring in the kick and season to taste, add snare, add toms/hats/cowbell/whatever until finished. I leave kick and snare centered and pan the toms according to how the relate best with the OH's usually in the 45 L or R range...meaning, if you have 3 toms, the 1st tom approx. 45 to the left, the 2nd at 0 and the floor tom 45 to the right. That is a GENERALIZATION not a PATTERN TO MIMIC. Sorry, just had to throw that in there.