Get a cheap heater gun and point it to the weather strip / glue (black) 8-10cm from the surface. The weather strip will get soft quite fast. Soften the weather strip on one side of the headlight and the start to bend in the edge using 2 flat screwdrivers. When the front-glass has come loose (1-2 cm out from the heatlight) start on the other side. Final heat the side where you findt the turn signal and it should be loosen.
The best way is to use some glowes and your friend uses the heather gun to heat the weather strip while you try to loosen the front glass. Using screwdrivers will damage the edge when the pressure gets quite hard on a small surface (will not be visible).
When you are going to install the front-glass heat the weather strip around the headlight (the weather strip should shine) and mount the glass back, hold the glass when the weather strip dry.
Also get some marin sealing (black) or silicon to seal the headlight in the edge when you'ar done.
Check my gallery for some pictures...
I have done this twice and noticed that's important with heat
More info on Angel-Eyes Thread:
http://www.xoutpost.com/showthread.php?t=114
Parts you need to remove:
