You already replaced the front oil seal right? It's similar to that.... except you have to remove the trans.

Procedure is the same as in the 05WK service manual we have a copy of. If you need to, download it here:
https://dl.dropbox.com/u/24438380/2005-WK-SM.pdf

Oil seal replacement is page 9-1376.

Hardest part, IMO, is R&R of the trans if you don't have a jack.