I probably can program it.The stepper you linked is ancient get this one.
http://www.ebay.co.uk/itm/New-CNC-N...g-cm-4-Lead-/221718641055?hash=item339f75f99f

 

Thank you for all your replies, my head is starting to ache! Right I'll get this one, do I need to purchase a driver board for it or will this be handled by the AVR? Also which AVR microcontroller do I need to get?!!

 

Get an Arduino clone from eBay like this one.
http://www.ebay.com/itm/Mini-USB-Na...for-Arduino-/271675478151?hash=item3f411ed087

You are going to need H bridge driver for the motors and 12V/2A PSU .

http://www.ebay.com/itm/H-bridge-St...For-Arduino-/251900163508?hash=item3aa66b75b4

 

If the angle and rotation speed aren't critical you could probably use a simple geared brushed DC motor with 3 cam-operated microswitches at 120° intervals.

Alec_t has it right. Use a wiper or window motor with a normally open microswitch riding on a cam. It will keep the motor running until the roller drops into a notch. A normally open push button switch (door bell) will start the motor again until the microswitch takes over again. It will stop at each notch.