Removing sockets and lights before plastering

Yes get an electrician in. Electricians know how to isolate properly and then reinstall properly,especially if you have two way lighting. As to what to ask for, exactly the same as your question

I would advise getting an electrician in to ease everything off the wall or ceiling then when it’s done fix it all back. Been to jobs no end of times where the sockets, switches, ceiling roses have been plastered around.

In my experience a plasterer will unscrew lights and switches from the wall, but not disconnect them, before they carry out the work and prefix them once finished. It might be worth asking the plasterer about this and see if they are happy to do that. If they're not you can just ask an electrician to disconnect them and make them safe.

In my experience I’ve witnessed plasterers be the victim of electric shock incidents, because electrical supplies to accessories and equipment were not isolated prior to their removal. They are a wet trade, they flick water and drop plaster all over the place, so my advise would be to have an electrician isolate the electrics and fit Yoozyboxes where required, and if the accessories aren’t going to be used it may be a good idea to tape a plastic bag around them to protect against water and plaster from splashing against them, causing internal damage. If Yoozyboxes aren’t an option then disconnection of associated circuits from their source while the plasterer completes their work is a must, in my opinion. Regards, Carl.