I did my '99 a few years back. I was working by myself it was kind of slow going, about 9-10 hours over 2 days, but I wasn't in any hurry. I kind of drug it out to be a weekend project with a lot of breaks in between.
Like said above, aligning the axle was my hardest part. I had an alignment done, but nothing was out of spec and it really shouldn't be, your not messing with toe or camber settings, about the worst you could do would be get caster out of spec, but without a shim or something I don't see how that could happen. I'd say if you want to spend the coin, get it aligned, if not watch your tires for wear. You'll have to adjust your drag link to center the steering wheel, but that doesn't change the alignment.
I read a post somewhere that said they did it without removing the springs, I suppose that would save some time, but it didn't occur to me and I just followed the instructions and removed the springs to add the pack.