Absolute beginner questions on converting a bathroom to a study

Hi all,

A bit intimidating to read some of these posts, but at least I am dealing with experts :-)

After some changes in our house to make room for kid number three, we now have an extra downstairs bathroom. I am looking to convert this into a study, and the room seems small enough that I could do most of the job myself.

The issue is that I am an absolute beginner, and I’d appreciate opinions on which parts I should do myself. I am 44, and not particularly strong….

We live in the Netherlands. The house was built in 1921 but this part is newer (1960’s, I’d guess) has thick brick/stone/block walls (about 16 inches think under the tiles, I think it’s cinder blocks but have not seen yet). The steps that I am aware of would be: remove the tiles from the floor and walls, take out plumbing fixtures and move plumbing for washer/drier about 10 feet to the other side of a wall, remove wooden ceiling, cut out space in the wall for an outside door to the garden. Then smooth wall and floor, add ceiling and door, some electrical, paint and lay carpet. We already have planning permission for the door, as we had considered having this done at the same time as the other changes.

My thoughts so far are to do the removal, ceiling installation and painting myself, certainly use a plumber and electrician and have the carpet laid, and I am on the fence about the door. Questions I have:

Does this sound reasonable? Also, for the removal would you suggest a jack hammer? I am a bit nervous that I am not strong enough for one, but doing the entire thing with sledgehammer, chisel and crowbar seems like a lot of work.

Any opinions an installing a Sheetrock ceiling and a door to the outside by myself, with help from my wife?

All opinions are welcome!

thanks,
Sean