Ted and Jean, I recently removed the FP in my BH. You will need to remove the trim work around the FP. Use a small pry bar made for use on woodwork. It will have a thin wide blade. Put a piece of thin cardboard under the pry bar. Then look for the wire nails that hold the trim on and work your way around the trim a little at a time. Takes just a few minutes. Once the trim is off, there are four screw holding the FP in. Two on each side. One near the top and one near the bottom.
Now you can slide the fireplace out. While you are in there, you might want to clean the glass, which is why I removed ours in the first place.
Peace
Dave