[Demon Lord Etna]

I'm fairly new here (and to anything "female" for that matter). I don't quite understand how the breast massage is supposed to be done. While the guys have their results, I wanted to get this answer from the smarter half of the species.

I got the general idea, palms across the breast, opposing circles so that you go down the inside and up the outside, but past that, I'm not grasping the concept.

How much pressure should I apply?
Should I allow my hands to move around on the breast or keep them firmly placed?
Am I grasping or just resting my open hand?

I got the basic idea, but no technique. Also, because I have oddly shaped arms, I have to reach across and massage opposite sides (left breast, right hand) one at a time.