If you have a few tools ,like a long handled 1/2" drive ratchet, you shouldn't have any trouble here. But you must put it all back together like it was.
One thing to check is the YOKE, once you pull that yoke out and wipe the seal surface off, inspect it for a groove worn by the seal. If there is a groove on the yoke you can catch you fingernail on, go buy a new yoke , because the new seal will not seal on that worn groove. You may get lucky and the new seal will be a little different, enough to wear in a different spot. (never my luck.... ). There are Sleeves available to slip over those yokes to repair the grooves, very thin steel sleeves, use loc-tite to hold em on.I have used these and they do good.
I would use a new nut if I were you , they have a locking friction that should only be used once... (yes, people re-use em all the time...).
I found this Video, might help ya out if you decide to tackle the job... "BH"
Chevelay, but the seal works the same...