Just moved into a new house and I couldn't get rid of the smell of ash from the fireplace.  I decided to put glass doors up so that it was contained when not in use.  These doors are sold just about everywhere, and the price on them fluctuates.  You have to watch it and catch it when it's down.  The instructions are a little confusing when it comes down to which bracket configuration to use (it shows 2 options) but eventually it made sense.  It wasn't too hard to assemble, just enough that you feel like you accomplished something, but not so hard that you wished you had called a pro to do it. The outcome is it looks great and no more ash smell!

Pros: Mostly pre-assembled, shipped fast, great quality
Cons: Confusing instructions