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Yes, I guess it's the kind of thing that usually gets carried out during refurbishment where the electrician is part of the team and works around the guys fitting the floor. Possibly having competent electricians on site and a registered electrician signing off their work. It might be why you don't see a lot of bathroom underfloor heating.
If you strip the floor and prepare it for installation of the mat, then they come and install and test the mat, then you fit your floor covering. Of course you are then taking on the risk that the fitting damages the heating mat. You also have to time everything around them which brings me back to finding one and discussing it with them.
The best way to go about that would be to contact an electrician first and then discuss with him how much of the installation you could carry out. Problem is finding one who doesn't mind doing that.
I had a funny electricians rate sheet at one point which went something like :-
£50 to fix the problem
£100 if your mate already had a go
£150 if you had a go
£200 if you want to watch
It's tongue in cheek but of course there's some truth in there.