I haven't taken my headlamps apart yet....I attempted it once to get the reflectors out...but I used a heat gun (industrial tool for working with adhesive and metal) and warped the rear of my driver's headlamp a little.
After the attempt with the heat gun, I just used the bulb hole.
To open them up you can use a normal blowdryer (for hair).
Here is a link to a thread with some better info and pics: HP user <a href="http://www.hyundaiperformance.com/forums/topic.php?t=20935"><b>itsbrad</b></a> painted his headlamps.
Note, use masking tape to mask off the turn signal area. Like ssraccent did:
[Edited by perlplay on Mar 31, 2003 3:49 AM]