Complete bathroom renovation after 25 years: How to plan?

I find images, which are plentiful on the internet, quite helpful. You can also use them here to look for ideas.

First of all, the design questions need to be clarified,

Then just ask what the employee means by

putting it into a 3D drawing, and then planning the bathroom.

It should mean the design. (Small) technical changes are taken into account. It's planned just like a kitchen. And honestly: an interior designer also needs the info from you about what you like and prefer, whether you are a clean-type person or would rather have a Sarah-Kay bathroom. Whether you can spend 30 or 50,000€. The same should be planned at the bathroom center. Not everyone has to be stamped as bad just because someone here talks about bad experiences. At our place, it was not even offered. What you like, however, you really have to decide for yourself. By the way: last year someone here mentioned 40…45 thousand euros for a bathroom renovation of normal size. And he was not the only one. If I were you, I would simply start dealing with bathrooms: the entire internet including Pinterest and Insta is full of fancy bathrooms in all styles.