Are professional painters worthwhile? Or do it yourself?

Maybe a stupid question, but if I now get offers from the painter for filling and sanding from Q2 to Q3, and then painting – but I don't want the stuff painted white, rather in colors – they do that too, right? Does that cost a lot more?
At the hardware store there are 1000 beautiful color cards showing in which shade you can paint your wall. How do I teach the painter in which "shade of gray" I want my bedroom?

At the hardware store, there are 1000 beautiful color swatches showing which shade you can paint your wall. How do I teach the painter which "shade of gray" I want for my bedroom?

You have to tell him the matching color number of the color you like. Either you ask him which brand he uses and have him give you a color chart for it, or you choose something from any brand and he can basically "convert" it. He has a table so that he can mix any desired shade from other brands as well.
Is the sink mounted on the wall...? -