Yes, anytime you want to move your dish to another satellite you will have to:
- Rotate it on the pole over to that bird(Azimuth).
- Change the up and down for your location(Elevation).
- and yes, you will have to move the skew.
A motor will run right off of your receiver, assuming you have a descent receiver. You can get a USALS/DiSEqC 1.3 motor and run a coax from the receiver to the motor then a short jumper coax from the motor to the LNBF on the dish. The receiver will send commands that will multiple

ride along ) the same coax.
The reason I say descent receiver is the fact that some don't have the power to push a motor very well and some of the off brand ones won't even send the USALS commands or send the properly.
First though I recommend you continue to move the dish around by hand to different birds and get some more experience under your belt. Adding a motor adds a whole other learning curve.