By a stroke of good fortune, I've just acquired a nearly new very high pressure airless paint spraying rig, complete with gun, pump, hoses etc.  According to the (rather basic) instructions, it looks to be fairly easy to use, but I've zero experience with this sort of spray kit; all I've used in the past is conventional spray guns and HVLP.    I've had a look around YouTube, and there seem to be loads of American videos on spraying house interiors, but all the ones I've seen are a bit