thing is with cheap paint jobs they all look good from a distance , all nice and shiny, its when you look at the details the story changes!!
all good bodyshops wont allow you to prep your own car unless your best pals with them, so really for a basic paint job and if no panels are required then you would be looking at around the £1k mark.
most places round here would charge around £2k for a full job
i have previously had a paint job that cost me £300 that looked spot on [so i thought] then one that cost nearly £3k, you might say you could notice the difference