The reliable way to hire a tradesperson

I would like someone to assess and remove a small stud partition wall that forms a cupboard in the alcove next to a chimney breast. I'd of course like confirmation that it's non-load-bearing before any work starts and potentially a quote for boarding over the bare brick wall inside ready for the plasterer once the wall & door are taken out. Does all this fall under one trade and under which category should I post it here? I originally had it under handyman but got no bites.

Had our bathroom tiled and the Mapei coloured grout has dried quite blotch in some areas. The colour is jasmine but it is not uniform, some looks the correct colour, some look paler and some look darker. Is there any remedial work other than grind out the problem areas and regrout? What caused this to happen in the first place? If we do have to regrout some areas could we cause a different problem if the mix isn't exactly the same powder to water ratio as the original, and end up with a slightly different shade? Thanks for any guidance anyone can offer. Carol

Could anyone recommend the best hot tap and filter system for kitchen tap water