Replacing alternator on 1987 truck

[KonCon]

Alright so another issue came up. Battery went dead and I was wondering what it was. I was able to jump the car to start it and with a little juice in it hook up a battery charger. When the battery was full, I checked and found that something was still drawing ~3.2 amps. I found out, that it's the alternator so I suspect that needs to be replaced. is that an easy job? I was thinking about renting a car lift bay in one of these diy garages as it will make it so much easier than in the street. Would that be someone with very little knowledge would be able to do? Also thought at the same time replacing the starter contacts as I've had issues with the car starting before and I suspect the contacts to be the reason. 

Thanks everyone