It's not too dificult, I've done several and I would say that the trickiest
area is around a door ie. sawing into the architrave and sliding the board
under without gaps. Go for quality (I found Richard Burbridge to be easier to
fit than the cheaper brands) and do practise runs say with hardboard for
awkward bits.
Once you get going its easy but do use a mask cos that hdf is nasty stuff, good
luck
John