Me again...

Firstly, in the bathroom, is it better to lay the floor tiles before fitting
the toilet and hand basin, then sit them on top of the tiles?
(I have a solid floor)

Secondly, still in the bathroom, I want to install a shower cubicle in my
bathroom with a solid floor.
I don't really want to raise the tray, so can I just chisel out the floor to
accommodate the waste pipe?
(although this room is on the ground floor, there is a height difference of
about a foot between the bathroom floor and the patio outside, so running
the waste lower then the bathroom floor level is not an issue)

Thanks!

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Sparks...