I've just moved into a house which has a wooden floor and a Baxi
Bermuda back boiler/fire.

A vent in the floor exists already but it's on the opposite side of the
room and will be covered up by the sofa.

When I got a guy in to service the back boiler, he said he recommended
installing a vent directly in front of the fire as the one currently
installed is effectively useless.

So, is it as simple as rolling back the carpet, chopping a square out
of the floorboards and the carpet and then screwing some fancy looking
brass plate over the top?

Or is there more to it?

Thanks for any help!