We have an interesting fireplace. actually just the fireplace mantle. as far as we know there has never been a fireplace in our house but the mantle is original to the house. we like the look but not the empty space.

what are our options for a fireplace with out having to build a chimney?
we would be happy with gas but wood would be really nice. maybe a pellet stove?

are the book cases too close to the "fireplace"? is there a minimum amount of space that needs to be to the right or left of the fireplace?

Has anyone out there faced something like this?

Is this something that a pro should do or can a handy home owner take care of most of the install (not including the gas)?

Thanks for any tips or suggestions?

You will also be faced with clearance issues on both sides. The book cases and furniture are way too close to the potential fireplace opening. Plus a hearth would have to be built out into the room.

What you're left with is a direct vent gas fireplace, many of which would fit nicely in the space, assuming it's on an exterior wall.

You might be able to cut the required opening as a DIY project, but I'd leave the rest of the installation to the pros from wherever you purchase the gas appliance. There are a number of code and insulation requirements that need to be considered.