Depending on your abilities and expertise, there are a variety of chores that you might be able to complete yourself as part of a bathroom renovation. DIY projects that could be considered include:
painting the cabinets or walls
replacing the toilet seat
changing the showerhead or faucets
the modernisation of the lights
installing a new medicine cabinet or vanity
constructing a new floor
setting up a new mirror
swapping out the hardware (e.g. towel bars, shower curtain rods)
It's crucial to do your homework and confirm that you have the equipment and skills required to complete any of these chores safely and effectively if you're thinking about taking on one of them. Some jobs, like plumbing or electrical work, could need a permit or are better left to a professional.