The reliable way to hire a tradesperson

Hi all, I have done some plastering recently its all turned out fairly well considering i'm new to it. However that's all been on fresh new plasterboard. I want to skim this kitchen wall. I have filled most of the big holes with bonding adhesive. My plan from here is to SBR the wall and then apply 2 coats of multi-finish. Would that be the correct way or should I undercoat first? I can't seem to add a picture but can send if possible. Thanks for any help :)

Hi, I have recently undercoated doors and frames with Dulux trade undercoat. They are different woods, and even with four coats of undercoat, they are still showing as different shades of white, the doors are more cream. I would like the finish to be uniform white. Will the topcoat do that, or should I Zinser bin first? Or will Dulux Once solve the problem? I don't really want to use Dulux Once. Rather use normal satinwood. Grateful for your advice.

I have an indoor fireplace where a coal burning range used to be. Bricks are either Edwardian or Victorian. The fire itself is now no longer used but bricks are stained. Some sources suggest not using modern brick cleaners on heritage bricks but I’ve found others saying its possible if the product is diluted or if the brick surface is wetted well. I’ve tried to find products specifically for heritage bricks but not having any luck.