Manual steering box seal replacement

Hi guys.
I am restoring a 67 dart with manual steering. My question is , can I just change the two seals on the box without taking the box completely apart? I have the worm seal out already but didnt take the lower shaft seal out yet. I dont want to get in over my head with 120 bearings and parts all over the place . BtW the seal for the worm shaft "top" doesn't seam to want to go in. Does it go in with seal facing the box ? I bought the new seal from skf 7412 . Does the metal part go up or down on the seal? Up looks right to me but it seems to putting up a fight!