It's pretty straight-forward.
I dropped the front driveshaft and removed the companion flange nut with a 1 1/8" socket. Tap the flange off with a soft mallet. The manual says you can't reuse the nut, but I know those that have. Under the nut is a rubber washer that slips over the shaft. Some people have fixed the leak by just replacing this washer, but I figured I might as well replace the seal since I was this far in. Pull the seal with whatever method works for you. You need to find something to drive the new seal in with other than a standard seal driver, since the shaft is still sticking out of the case. I used a piece of copper pipe with an OD of 2 3/4" that I had. The manual is very specfic that the seal must be seated . 08 to. 10 in. below the seal bore. I didn't apply any sealer to the outside edge of the seal, but I have heard some guys needed to do this in order to get the leak stopped. Install the companion flange and torque the new nut to 130-200 ft. lbs.
Bob