Bioman, I use IP and FP exclusively with a PC. A rotary probably can get better results quicker but I'm happy with results with a PC.
Have no fear, they're fool-proof.
I used them to do this Jag, topped with the Autoglym duo.
I posted these instructions on a recent thread to someone else who was concerned.
For IP:
1) Spritz your dry pad once or twice with a QD.
2) Squeeze a generous ring of polish on the pad.
3) With the PC still off, spread the polish on 2x2 area.
4) Set the PC on 3 and spread the polish evenly.
5) Start at one corner of your designated area and, with the PC on 4.5 and medium pressure, move very slowly (1/2' per second) left to right then up and down for one pass. When doing this, you should see the polish liquifying and going clear at the edge of the pad. This indicates that you're moving at the right speed. If you don't see this, slow down and/or add a little more pressure.
6) Turn up the speed to 5.5 and again, slowly, follow the above procedure. By this stage, all the polish should have gone clear and oily.
7) Take off all the weight from the PC and keep working the clear residue for a couple more passes or until virtually gone (at 1' per second).
8) Wipe off residue with a MF. You won't need water or any liquid to achieve this. It should wipe right off and leave the surface glossy and squeeky to touch. It leaves no oil or fillers.
9) Inspect your work to see if all marring removed. If not, repeat the above. All subsequent applications should require half as much polish now that the pad is loaded up. Always work the polish in well.
For FP:
Same as above, except:
1) Use a light polishing or finishing pad.
2) Apply a thin line around the pad once its loaded after the first time - the less the better.
3) Set the PC at 5 after the initial spreading.
4) Only apply the weight of the PC, no more is necessary.
5) Only requires a couple of light passes.
6) Move the PC at 2' per second.
7) If your pad can handle it, crank it up to 6 for the final light burnishing.
8) Stand back with your sunglasses on and admire the glossy finish!
I hope this helps you. :bigups