@RogerS:
A very impressive video you linked to, and as I hate painting myself, I can well understand you being tempted. But IMO there are some BIG buts you ought to consider before taking the plunge (and I'm not suggesting you're an *****, really not (!) so you should REALLY fully consider:
1. Cost - buy or rent, that equipment looks expensive - very expensive, and if buying, not sure what the re-sale value would be (or if worth keeping for future use). And don't forget the cost of all the protective gear;
2. As Chrispy and others have mentioned, please do NOT underestimate the time (and the not cheap overall cost) of the masking - including well outside that open door in the video. Example: I've just done one wall of a pretty average size bedroom (with a roller) and including the masking, covering the PART (only) of the carpet that was close by the subject wall, the skirting of one wall, light switch, power point, paint mixing/filtering and clean up afterwards, the job took a full 1.5 days;
3. Would you REALLY be happy to have your paintwork the same colour and same paint type as the walls? If not please add time for gun clean/colour change and new paint prep;
4. If you were doing a "closet" like that in the video, ditto Q3 above?
5. I appreciate the present plaster dust all over the floor suggests no masking/cleaning, but unless you remove it (or mask it thoroughly) the dust and any paint spills/over spray will surely tread around the rest of the house and/or get stirred up (by your movement) into drying paint?
6. How noisy is your compressor? Mine is LOUD!!!
I'm NOT trying to rain on your parade, and there are many more people here with MUCH more experience than me, but every time I've used spray gear, all the prep and after cleaning takes so much time that in essence I find it only worth it if I have a HUGE amount to do (or in my case, a "batch" of smaller items).
But if you do go ahead I'd really like to hear how you got on.
AES