Clean. Clean everything. Before i rebuilt mine it would leave puddles of gear oil and grease because it leaked so badly. Now it doesn't leak at all. Cleaning stuff well makes just about anything easier.
Do one side at a time so if you get completely lost you can take apart the other side to see how it is supposed to work.
If you take the hub dial assembly apart, don't loose the little tiny ball bearing like I did the first time.
Umm... don't over torque anything like I did and break bolts off.
Also, on both sides of my axle, the top caliper bolt was stripped, so I did not torque them down to spec when I put it back together, I just tightened it until I felt it was about to brake loose.
Study everything on the subject you can before doing it. I read a few articles on line about it, and I read my FSM about a dozen times before tackling it.
Other than that, the only real advice I have is make sure you get those Marlin HD front axle seals.
