Trying to describe a tech. in writing can be tough. I'll take a shot.
Since I was teaching an aikido class I'll use those terms.
Lets say that the attack is a shomen attack or a downward strike to the head. The response could be a kaitenage or rotary throw, or puter kapala (sp.?)The pickup for this movement would be when they move, you move. That is to say when their arm goes up to strike, you move in or enter. Lets assume that they are attacking your R. side with their L.. When they raise their arm to attack, you step in with your R. and raise your R. arm to their L. arm while tenkaning counter clockwise. Then you guide their L. arm down with your R. and continue the movement or circle around while putting your L. hand on their head and rotating their arm over their back, sort of like a lever and push their head down. Rough description, I know. But the pressure sensitivity comes in right at the beginning, when you move in and meet their arm. So many times I see people just muscling or grabbing the arm of their partner. The illustration is to simply use the area between your wrist and hand (R. hand) and feel the pressure of the movement at their outer elbow, not grabbing, but feeling, and guiding with the edge of your hand until, after rotating their arm, your hand naturaly comes to rest where it needs to, on their wrist. Now finish the movement. Once they got used to not grabbing all the time but using pressure sensitivity, things got much easier, less awkward. I realize this is a rough description but I hope the point came across.