Place a commercially available creosote-sweeping log in the grill of your fireplace. Open the flue of the fireplace and light the log. These logs, which take roughly 60 to 90 minutes to burn completely through, are chemically designed to remove the buildup of creosote from your chimney.
Sweep the remains of the creosote-sweeping log off the grill and onto the bottom of your fireplace, using the fireplace broom.
Remove the grill from the fireplace and scoop the remains and any other accumulated ash and debris into a trash bag, using your fireplace shovel.
Place the grill back inside the fireplace and dispose of the trash bag.
Open any windows and doors in the room containing the fireplace. Bring one or more large fans into the room and circulate air throughout the room for two or three hours. This should mitigate most, if not all, of the creosote odor.
Repeat steps 1 through 5 if necessary. If the smell persists, it may be necessary to contact a chimney sweeping company to professionally clean your chimney.