The reliable way to hire a tradesperson

I’m in the process of doing up my living room and had the thought of adding garage access whilst I was doing so. I live in a persimmon new build and was looking to install a fd30 door and get smoke seals for the door. I know I’m going to need to likely put something above the door to support the weight above. But where do I start with a project like this. I’m not planning on converting anything in the garage purely just for access

Hi, what would be the easiest way to re gloss my staircase please, it’s currently white & I want to gloss it grey, do I remove all the gloss with a heat gun or paint stripper or sand it down, apply a primer then apply new gloss?? Thanks ☺️

How can I tell if a wall is load bearing ?