Prop seal replacement on Honda 50a

I am looking to replace my prop shaft seals on my 1996 Honda 50 motor, as all service shops are booked until the end of August, and I don’t want to miss this sailing season waiting! I wonder if anyone has done this job, and can give me advice? Can it be done safely without removing the carrier, which needs a special tool or two that I don’t have. Does anyone have the tools?…. Help please! Thanks