Even using the u-joint it was still difficult for me because the space between the bolt head and that hard a/c line is very little. The u-joint socket needs quite a bit of space for the actual socket part that seats on the bolt head, as well as room to swivel and connect to your ratchet or extension. I cursed violently at mine for awhile, and like I said, I don't remember the exact position I had to maneuver the ratchet to get in there, but it took lots of trial and error and trying to get it at from different angles.
I've always heard of people saying how easy it was to swap an alternator; maybe the spacing is different on a Gen 2. I haven't had to swap mine out in the 95 yet, knock on wood. I know for the Gen I's that bottom bolt is horrible.
This is probably one of those situations where a gear wrench would come in handy due to the lack of space.