KH Brake Cleanup and Reassembly

So I've got my KH system taken apart on my 68 Dart. I've currently got it down to where I just have the hubs and I've cleaned up most of the old grease inside the hub with a rag. I already have new seals, studs, and rotors on the shelf and I've got new, Timken wheel bearings coming in on Friday. Before I start putting things together is there anything I should do to clean or degrease the hubs further? I know I don't want to scratch the bearing races. Where would be a good place to buy bearing grease as the stuff I have is pretty old? I know this is a dumb question but how would I press my new seal back in there? They're NAPA seals and don't quite look like the originals but still has the same overall dimensions.

I plan on putting the rotors and studs back on by throwing a stack of washers over the studs while they're placed in the rotors and hubs and by tightening the lug nuts so that the studs slide into the spline.

Thanks for all of your help. Any thoughts, opinions, or advice is appreciated. This is my first build and I need to slowly get my project moving forward again.