Thanks Christian, is it technically difficult for a newbie DIYer to
replace the plasterboard?

Assuming it is plasterboard on a stud partition, then it is extremely
simple. It just requires enough strength or a helper to manoevure the board
into position and a good battery drill to knock in the plasterboard screws.
Dot'n'dab drylining is harder to replace, though. Use "taper edge" board and
then tape and fill the joins. Because the tapered depression is narrower
than the float, it is easy to get a flat surface with a bit of polishing. It
is nowhere near as difficult as real plastering.

Christian.