single hand operation.
I did some cutting on bumpers of Lahori's car and applied wax using rotary on more than half the car. My experience with rotary was great its a great yet dangerous machine :).
I did cutting at 3k rpm whereas Usman bhai did it at 5k and 6k rpm. there was some vibration in rotary at higher RPMs which makes it difficult to handle for novices.
If I hadn't seen Usman bhai using rotary, I am sure Lahori could have black bumpers instead of shiny white bumpers 
Hand pressure while using rotary for cutting was very light. I made sure that the pad of rotary is touching the surface at the lightest pressure. And it was very easy to control rotary while cutting.
After cutting the bumpers I applied wax on bumpers, hood, 60% portion of roof top and also left side doors. Wax kertay huey rotary achi khaasi larrai ker rha tha even at 3k RPM. then Usman bhai told mein a technique and following that larrai kuch kam ho gai.
Conclusion:
Rotary is a very effective yet dangerous tool. you should have some experience of handling this type of machines under your belt otherwise it can create a lot of mess. A first timer must see someone experienced before using rotary or at least he should use rotary under supervision of some expert. Also start with lower RPMs and with time and experience go to higher RPMs. And most importantly do handle this tool with a lot of care 