The first fixture took about 40 minutes, the second one about 5 minutes! Swapping sconces is pretty simple.
Turn the power off at the breaker box.
Unscrew the old fixture from the wall.
Undo the wire nuts and pull the fixture off.
I had to add a new mounting bracket since I didn't have one with the old fixture, but if you've already got a bracket, just skip to the next step.
Match the black wire from the new fixture to the black wire in the wall and screw together with the wire nut.
Match the white wire from the new fixture to the white wire in the wall and screw together with the wire nut.
Wrap the plain copper wire (sometimes coated in green plastic) around the green "ground" screw.
Cover it all up with the new fixture and screw it in place (depends on the fixture on how that is going to go).
Ta-da! So much better don't you think? I got these cuties from Lowe's for less than $20 each!