Well, you shouldn't buy uv protectant glass 
unless it is the only thing you can.  If you can 
find it get some uv protectant plexiglass, since 
if your cels happen to fall off the wall they 
don't get diced with sharp shards.  

YOu should also buy the non-acidic backing.  
Besides that, i don't see the difference in 
having it professionally framed.  All they do is 
maybe make it look a little nicer and charge you 
a whole lot more.

I haven't been able to find protective uv 
plexiglass, then again i haven't asked.  It 
didn't occur to me until my son knocked a framed 
one off the wall.  Now that one belongs in a cel 
grave graveyard. 
*cry's a little*
Now i am going to go to a craft store and see 
about getting some before i put any back on the 
wall.