Unless you want to get involved in re-plumbing or re-wiring...bringing the existing configuration "up to date" is probably the easiest and cheapest way.
When we did ours, we selected and bought the vanity/taps, shaving cabinet, the toilet/ pan and managed to re-use the shower base and screen.
We selected and bought the floor and wall tiles and new light fittings.
Shopped around for a local builder " we're all busy at the moment - may be start in two months!!!" They were right - a two month delay!
The builder ripped up the old floor tiles (on concrete slab) pulled the wall tiles and made good the waterproof panelling.
He then installed all the bits we had bought.
We did the painting.....
HTH
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