Get a flat headed screw driver under the lip of it and it should prise out

Hello Apismalifica, If the room is really large then it's possible the fireplace is actually right size wise, if it's still the original proportions and you'll see if the chimney breast and fire are proportional. In a lot of cases they are filled in and made smaller at later dates such as the 30's so you'd notice. You've said it's not proportional and so perhaps the room has been divided at some point.. Really the key thing is to identify whether it can sit in the room without looking odd. Secondly a kitchen layout that doesn't mean removing the fireplace but as others have said possibly making use of it somehow like installing an aga or something - if it's a big room it may be possible to keep it as a feature or re-instate it's use and have a galley along the opposite wall for example? So you have both kitchen and fireplace... Pictures would indeed be good but I usually like to work with period features.. Regardless of whether you have another, see how you can work with the room.. : ))

It should be this type of set up: So the rounded part next to the staples in your image will remain in the base of the sofa (probably inserted into a block of wood). This has a hole in it which the castor is then punched into.

A pro can do it in no time. If you are planning on a new hearth now is the time to do it. Most period fireplaces had a hearth that was flush with the floor and likely a replacement would sit on that so the fireplace would need to be raised an inch or so.