I dont know anything about the servo models but the stepper controllers are about as easy as it gets. Everything is clearly labeled and screw terminals are provided. You simply provide step & direction signals from LPT1 of your computer, power for the drive (5V), power for the motor, a current limiting resistor (the value is printed right on the case) and then hook up your motor via 4 contacts. Resolution is jumper pin selectable. There are two models, one unipolar and one bipolar I think. Yes you can figure it out. They have great support also. There is also a resting position current resistor connection also, at least on the 256 microstep model. The "bigger" power supply is just a transformer, a bridge rectifier and a capacitor, plus some fuses. Its not a complicated power supply thats for sure. I dont think theres anything that would trip you up, especially with this forum for help.
Halfnutz
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)