Welcome to the Bunnings Workshop community @Narelleh. It's great to have you join us and many thanks for your question.
Replacing the tub would be a straight forward procedure for someone that is relatively handy. If you wish to install a sink mixer in the new tubs single hole, then you are now in the needing a plumber department. They will disconnect your existing taps and spout to plug them. You'll then be left with holes in your tiles and they'll likely need to be replaced.
Your tapware looks fairly up to date style-wise and I would be inclined to leave them there and just replace the tub. The hole in the tub can be covered with a Kinetic White Basin Cover Plate.
The washing machine drain hose will need to be routed through the new cabinet and connected to the waste.
Please let me know if you need further information or had questions.