The reliable way to hire a tradesperson

I want to disable and turn off my home alarm permanently. Can i remove the fuse from the mains spur leading to the box so I cut the Power to it and then let the battery run down over a few days /weeks. Would that ultimately disable it? If I have a power cut the alarm does not trigger so i guess this will be the same?

We have trunking since having our whole house rewired in 2019. However, we are having a new kitchen installed within the next month. The kitchen fitter has insisted on getting rid of the trunking in the kitchen, and putting the electricals back inside the walls, so the new kitchen will look better. I am a disabled person who feels perfectly safe with a trunking system. Is it possible to have the electrics in the kitchen rewired back into the walls? Will the appliances in the kitchen work if they get rid of the trunking and do it that way? And also, will it be safe?

Should a shower door be fitted to wall using screws and will this brake the tiles when driling holes. Or is it normal to use silicone to fix the frame to wall instead