It's a doddle, mind you SMD is Darren B's apprentice, and he spent a day at the Zed Shed (where's that mechanic smiley when you need it?)
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Fitting shouldn't be much, you could probably do it yourself.
I fitted mine myself, jack the car up onto axle stands and its a half hour job, it comes in pieces but you can put 90% of it together before you get under the car.
The only issue I had was it attached via bolts to a hard plastic beam and the original bolts had rusted away and snapped off, probably why my oem tray hung low.... All I had to do was drill a couple of small holes in the Zspeed and screw it into the plastic strut which is hollow anyway
Basically what I am saying is, if I can fit it then anyone can