If only it was that easy to address substrate preparation in a few comprehensive sentences.
Unfortunately you could prep and tile 10 floors in a row and each and every one could require different approaches.
Without specific questions or details it’d be almost impossible to guide you.
If the surfaces are already tiled, you can’t really determine what preparation is going to be required until they’re stripped back.
You can have a reasonable guess, and formulate a basic plan and cost, but it can be in no way a fixed quote, you must have room for movement in costs.
Even if it appears it’s just a case of removing tiles from a solid floor and replacing them.
It could have deeper issues which won’t become apparent until it’s been stripped.
And if you’re new to the industry, prepare for mistakes on your part, because you will make them, and you have to be prepared to take it in your stride. You also have to be prepared for things to take longer than they might for fully experienced fitters, because of course, they will.
But that’s at your expense, not your clients.
Maybe you should be considering shadowing a local tiler, even if it’s for very little money even free of charge one day a week.
It’s a hard road being totally self taught.
So I’ve just been reading all your previous posts, and whilst it’s apparent you’re very new to the trade, you do mention in one post that you’ve been taught to use trim.
So I’m assuming that’s not only thing you’ve been taught, be pretty strange if it was.
It’d probably serve you well to tell us a bit about your background, exactly what you’ve been taught, and why you find yourself trying to cope with very little knowledge.
I appreciate you may feel a little uncomfortable with the idea, however, a little humility in here can go a very long way.
Start a new introductory thread
HERE
Of course you don’t have to, it’s entirely your choice.