How do you remove the headlight unit on a 97 Ford ExplorerXLT

don't cut the wire. If anything just pull the fuse lol

There isn't a fuse for just the horn so we pulled the fuse for the Anti Theft but that didn't work either

Looking down from the top you should see four screws. Look closely, two are for adjustment of the lens and two are for removal of the removal. One should be on the extreme fender side and the other toward the center.

I don't see what the horn has to do with your question of removal of the headlight unit. OJ told you exactly how to remove the light. Now, about the horn, you must have a short in the system that you need to track down. DO NOT CUT THE WIRE as this is important as a safety factor.