Since I just did this on my bus I can say that unless your coach has some obstructions I do not have, the installation should be easy and not involve a lot of time.
The only precaution I would suggest is that as you drill in the vicinity of the wire bundles you use extra care to make sure the drill does not slip or the bit does not break. You want to take pains to not risk damaging the insulation on the wires in those bundles. I found there was ample room to drill the holes without coming close to the wires.