Replacing steering column lower seal (Pin Removal)

Hello Members. Can anyone provide some advice on replacing the seal on the steering coupler on an early A 65 Dart? I need to drive/push/remove the pin out of the lower end of the steering shaft in order to slide the new seal onto the shaft. The seal that seals The top end of the coupler. The problem is that pin, mounted through the steering shaft, seems very well "INSTALLED." What is the best way to remove that pin, and for that question, will there be issues with reinstalling the pin? Thanks for the advice.....much appreciated. sgrip65