If anybody is considering DIYing this ready to roll plaster or doing a proper skim coat, I'd recommend getting a few sheets of plaster board, and trying it out first. Attach a few battens and maybe a couple of squares of ply to simulate corners, sockets, light switches etc., and see how you get on.
As I'm sure legs-akimbo will testify, plastering is a skill that takes practise, priactise, practise, and then a little more practise. I've skimmed a few rooms in my place, but was only able to tackle one wall at a time, and while I'm happy with the results, they've not quite up to pro standards.
Leo