It was super easy to put together.   I used a socket screwdriver with the Alan wrench bit with a Philips screwdriver.  Made it easier.   The fireplace itself screws into the mantle.  Use a power drill.  No problem.   Works like a charm.  Awaiting my 75 inch tv   Coming in tomorrow.  It has exceeded my expectations.   Looks classy and produces heat like it says.   Love this.  Glad I bought it!