I have a 2001 honda accord sedan and I tried to take out the headlight unit to "blackout" the inside of the assembly but i couldnt figure out how to. I tried to look it up but couldnt find anything helpful

 

It's pretty complicated and tedious. You have to use an oven and bake the headlight casing open, and then use a certain glue to put it back together, and bake it again. It's just tricky because if you don't do it right, water will leak into your headlight. If you want more information, you can PM me. I just don't want to write out a whole tutorial if you're not going to end up seeing this