I've never looked into having to take the whole bumper off to change the lights. I have a stock 93 Si and have stockers

I found this:
"1 screw under each fender in front of tires, then about 6 screws under the bumper...open the hood, unscrew the headlight screws....pop out the little pop in screws and slide it off.....ur all set"

Thats for a 99-00 si and was in response to your same question but for a 2002 EX, so i'm pretty sure that goes for you too!

And why the name preludegirl if you own a civic lol.