I replaced all the bearings and seals on my '47 C tricycle front earlier this year during a full restoration job. My local bearing distributer was able to get both the seals and bearings/races for me.
I don't know that there is an easy way to remove them (just be patient and take your time). But as for reinstalling the top seal, I made a custom fit bearing "installer" on my wood lathe (I turned a wooden cylinder down to the right diamater so I could slide the seal onto it). The cylinder was long enough to extend out of the pedestal and had a lip just slightly smaller than the outside diameter of the seal. This allowed me to gently tap the seal into place.
If I remember correctly, the bottom seal was a bit more difficult as the bearing and seal had to be installed on the shaft and then the shaft reinstalled. If I remember correctly, I think this was the worst part of the entire job. Be careful as you have to keep a close eye on the seal so it doesn't get damaged during reinstallation of the shaft(an extra set of hands should eliminate the problems that I had!).
If you need any part numbers, I have the seal and bearing numbers. All replacement bearings/races were Timken and all seals were Chicago Rawhide. Just shoot me an email if you need them.