front wheel bearings

[1969 GMC]

Hello all,
I asked this on the engine board but was hoping to get more responses. my trucks front axle is howling, and it is time for new bearings (i hope). i have a dana 44 front axle (and YES, that means my truck is a 4x4) with closed knuckles and drum brakes. what all do I need to do to replace the bearings? cableguy said I need to remove my drums, but what after that? will I need to take the axle knuckles off? my dad would normally help (mechanic) but he's never done them in a 4x4. thanks in advance.