I would bet a pound to a penny that the finish pvtighe is passable at best and seeing as it is your own work you have turned a blind eye to how imperfect it really is, had a plasterer been paid to do the job and left a finish equivalent to that you now have you would be screaming blue murder. Not only this but how long is it going to take you to do six rooms or more, you could go and stack tins of beans in tescos for the amount of hours plastering with a paint roller, scraper and sandpaper, and with the money earned paid a plasterer and still had enough change to take the mrs out for a weekend.
If I had a yo yo for the amount of times I have heard the line "well I did this all myself, it took a very long time but I am a perfectionist you know, good isnt it?"
Errrr no.....its s**t!!! ( I think but dont say, am far too polite!!)
Just an experienced observation, I could be wrong.