Not a whole lot to worry about. Likely you've already got the fluid drained from the axle, or jacked up nice and high on that side. It is a good idea to pull the Center Axle Disconnect out, it's just 4 bolts and you can seal it back up with silicone. Pulling that will allow you to pull the lock collar out so when you put everything back together you can make sure it isn't in the way. Really is a good idea to put new seals in if they're more than a few years old, the axle lube tends to dry them out and when you put the axles back in you're very likely to damage a dry brittle seal.