Part of the estimate may also be predicting seized tie rod adjusters... took a couple tries to get mine aligned due to it seizing on the rack (I freed them up with liquid wrench and a pry bar and returned the following week).
Honestly for the work involved, it may be worth doing all 4 tie rod segments... align once, cry once. I didn't follow my own advice through and only half my joints are recent (one outer, one inner, opposite sides); there isn't a hard/fast rule.
Not that this is good practice, but if memory serves I didn't even jack my truck when I did the tie rods... just set the parking brake, popped out the old, popped in the new.
1984 F150: 300 L6, AOD, RWD. EEC IV / TFI, Feedback Carter YFA Carb. Stock everything but radio (for now).