The easiest is to buy from Harbor frt the small pick set. Remove the cotter pin,
unscrew the white plastic nut closest to engine until you can pull the gland closest to engine. Then using the curved pic pull out the packing. If there is a white plastic washer then you need to pull that out . Cut using a new razor blade, the packing by wrapping it around the shaft and mating it end to end. Insert the packing with the end at top. Then using the plastic gland push the packing in as far as possible the start to tighten gland using hand only then loosen one turn. There are only two packing. replacing one will be ok. inspect that you get a drip and not a constant run. if no water comes out then run boat for 15 minutes and loosen nut.
Capt Rick
also read bulletin on packing replacement.