Assuming you're talking M939A2
It's probably the easiest part of the job, spray all the nuts and fittings down with WD-40 or your favorite penetrating oil, well before hand.
Make sure you wear your safety glasses and ear plugs when disconnecting the air hoses.
Be prepared to replace your wheel valves, as the aluminum threads corrode up and usually gaul really bad when you take them off.
When reassembling remember anti-seize is your friend, smear that ##it on everything, don't stop until you look like the Tin Man from the Wizard of Oz, just don't get it inside of the air system.
I'll leave the torquing of the Lugnuts question to the "read the TM" guys.