Typically with Ford trucks the older they get the easier they are to work on...sometimes.
The engine compartments tend to have more room, but stuff starts getting a bit rusty and hard to break loose when they are that old. I'd suggest having a can of penetrating lubricant to use on the bolts, and make sure you bring a breaker bar to use on those hard to break-loose bolts.
Otherwise, it shouldn't be THAT huge of a chore.How hard is it to change an alternator on a 1988 ford f 150?
as with most vehicles, it is an easy job, about 20 minutes work for the average person.