I'm thinking of managing a bathroom Reno for my elderly mum's new property but am a complete newbie to renos. How difficult is it to do?
The main issue is the bathroom floor and shower floor are not level. There is also a hob to step over so I'm hoping to make it less of a falls risk.

I'd need to arrange for the flooring to be leveled to create a walk in shower. The unit is on the second floor of a complex with another resident underneath.
I know this is likely to be costly but what sort of tradie does this?
Would this even be possible?
It looks as though the previously was a bathtub in place as there are existing tapware at that level.