I just did this on an 8 3/4 which is about the same as a dana, at least the parts are the same.
The inner seal, comes out great with a seal puller
much easier than using screwdrivers or a punch or chisel.
Just clean the housing well before You tap in the new seal. I see from Your other post, its not the "green" bearing type of install....
Also, slip some grease into the inner seal, and area, to help lube the axle when slipping it into place. Be very careful, to not slide the splines of the axle across the seal lip.
and even rest the full weight of the axle shaft onto the seal. Necessary? maybe not, but why take any chances?
It all goes together, just like the factory service manual describes.
There are also some very good detailed photo's of the whole assembly to look at.
Its how I found out that there was an outer seal on mine !
and your right, changing that seal...you need to remove the bearing assembly.
The good news is...after everythings been fixed and replaced and done....it should last for a LONG time and You don't have to worry or see any leaks!
sorry for the too long answer! just bored I guess.