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Boarding a ceiling is easy enough with an assistant. If you have access to the room above then it's a quicker way to find out where the joists are.
I'd never attempt actual plaster skimming though, that's a specialist job. You can go down the 'board and fill' route as a DIYer, but this is so messy and time-consuming (sanding a ceiling is basically the worst job ever) that I'd advise against it.
Most SE plasterers would charge £150-£300 per room to skim the ceiling I'd have thought.
Cheers, I thought as much.
The thing that's odd is that they didn't mention the artex in the common areas.
How feasible is
for an amateur DIY'er with only one reluctant partner to assist?