First off, welcome to the club.
I got a '95 but my Haynes manual covers '85-'98 so I might be able to help. Here is what my book says:
1 ) Detach the cable from the negative battery terminal.
2 ) If the antenna is nounted in the fender, remove the screws and clips and pull out the inner fender liner. If the anntena is rear mounted, remove the right side trunk liner.
3 ) Remove the sound insulator from underneth the right side of the dash.
4 ) Unplug the antenna leads from the relay and the radio. If the antenna is rear mounted, unplug it from the body harness.
5 ) Remove the antenna upper nut. (this is what you did)
6 ) Remove the antenna bracket screws. (The pic shows these inside the fender at the base of the rod)
7 ) Pull the antenna assembly up slightly to seperate it, but don't remove it.
8 ) Wrap the lead wire so it can be threaded back into it'* proper location.
9 ) Remove the antenna assembly and the old grommet or bezel.
10 ) Install a new grommet or bezel.
11 ) Feed the new lead through the grommet or bezel and carefully thread it through with the wire.
12 ) The remainder of installation is in the reverse of removal.
That is what the book says so you'll need to apply that to whatever type you have.
Hope that helps.