Good diagram. It's not difficult. you should be relatively comfortable around wiring something simple like an outlet or light switch. (which is basically what you're doing)
Yeah, I've put lightswitches and dimmers in,but that's about it. So it's no worse than that, eh?
Reason I ask is Ranco is REALLY bad at answering e-mail and i need mine wired for 240 v, not 110/120. Figure it might be easier to just order the damned thing and wire it myself. And cheaper.