The important thing when retrofitting your headlights, if your car is a daily driver, is to have a backup pair of headlights. My retrofitter wanted $580.00 for a basic system. I wanted special housings, special paint (performance blue in ceramic paint) and an LED strip, so mine cost about $870.00. My guy (sickhids.com) is so covered up that it typically takes 6 - 9 months for return. Check the other retrofitters out. There is definitely a trick to opening these headlights, and baking no longer works (since 2011, if not earlier). Check out my build log for the work done to my headlights.
http://www.fiestastforum.com/forum/threads/2353-WestcoaST-Performance-blue-build/page8
I'm really pleased with the quality of Bryan's work, even if he takes forever.