Don't overestimate of whats really involved and anyone with a drill and a screwdriver can remove the old one and put new brackets up, the electric work is no more than changing a plug, just three wires Live , neutral and earth. No sparky really nessesary provided all the wiring in good nick.
that info may be no good unless your going to diy or have a friend do it, but it
may prevent you being overcharged if you understand that its generally a very easy install