Well, I tried the lights again. They came out pretty good this time. The tips I got for you are the following:
1. Take your time. Worst thing to do is rush. You'll get really frustrated.
2. There're three pieces to the tail light...The outside (part that other people see), The end where you plug in your light bulbs and the middle piece. When you take your lights apart, clean as much glue as you can off the end that people see. If not, when you try to stick in the middle part after taking out all the red and yellow pieces you will drag glue and that glue will be visible at night when you have your tail lights on. Try to clean the glue while it's hot.
3. To cut the diffusing plastic I used a table saw. The blade didn't have any teeth, it's just a blade to cut tiles. The high speed of the blade made it easy to cut without craking that diffusing plastic. If you try to cut it with scissors it will crack.
4. You'll probably have some critics when you tell them that you want to take apart your Lexus. them, have confidence and patience. When you're done with it you'll be proud.