Replacing the axles (AKA jack shafts) is a completely different procedure than replacing the halfshafts. Its not necessary unless the green cups are shot &/or you have leaky axle seals. I would pull the half shaft and inspect the green cup. If the slots are worn in the cup, then it will need replacement & you'll have to pull the front axle.
Also, I would replace your ball joints while you're replacing the front end.