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Most companies that make it sell the stuff will only allow it to be laid be skilled labour that they have trained (the Karndean installers course is ~ 5 days). This is because it is critical that there are no ridges in the subfloor that will cause stress points and subsequent failures over time, think a credit card that sit in the same place in a wallet with the same stress applied every time you sit on it. To prevent this there is at least 2 screeds laid before fitting.
There are LVT products that are designed to be laid by diyers and other trades but the warranty is much shorter and AFAIK the material cost is higher so long term you don't save that much.
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This sounds like all the motivation I needed NOT to do it. Thanks @Bobbo :)
How hard is it to lay an LVT floor? around 8sq/m in the kitchen. Floor is levelish but not perfect...could have it screed if necessary.
Edit- question 2 retracted.