Start by removing the Small (Real small) set screw on bottom of head light assy. (It holds the head light ring)
Then grab the front headlight ring and counter clockwise turn the ring free (TRY Harder)
Then take a small pointed screw driver (There's a tool for it but some replacement kits don't include it) Mine did

Turn that inside ring out.
That's it. Unplug the old light put new light in and reverse order to install.
Takes 20 min unless you get ticked off. Then it takes 1 hour and a few more beers.
Good luck
And if you need pictures
http://www.bigdogbiker.com/forums/how/12-how-replace-your-headlight.html