It needs a 12-24v 6a & 5v 1a, You could use a PC ATX supply as this will give you both 12 & 5v with more than enough current (cheap as chips 2!), and pretty safe for a "not so electical person" to work with.

Search the posts for PC or ATX power supply as there has been a few good explanations on how to do this in the last 48 hours.

However not all drivers like working at the lower power input range in which case I would go for a 20v 6a laptop charger off ebay for about £13 and a either a 5v regulator for 5v bus or a seperate "plug in" 5v adapter for the control bus.

Michael.