You can labour yourself than a lot more than that's been suggested so far - my family has been renovating for years and usually what happens is you'll buy a property that has been repossessed, or some old codger has popped his cloggs in, so it'll have old fittings (like the kitchen, fireplace, old bathrooms) which may need completely demolished - this you can do yourself with a mel hammer and a crow bar.
Old council houses usually need new plasterboard, completely new wiring, plumbing etc. This is the sort of stuff you can rip out yourself, but if you're not in the trade, you'll have to get sparkys, plumbers, joiners and plasterers to come out to re-fit.
It totally depends on the time you'll be devoting to a project. If you're there full-time you can do a lot yourself, but if not, you can easily get cheap labour in as stated above.