Since i didn't take any pictures I will try to explain best off of the factory schematic. Also available here https://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1981&hp=25&model=J25RCIM&manufacturer=Johnson§ion=Gearcase
If I explain anything incorrectly let me know, definatly not a marine mechanic but it seems pretty straight forward. And I take no responability for these instructions, they worked for me and I hope they work for someone else in the future.
Part # 25 gearcase head assembly. This houses your two prop shaft seals that sit back to back (one seals the oil in, and one the oil out your thicker seal goes on the outside). I took this off the prop shaft and place it in a vise and used an older screwdriver to slowly tap out the seals. These came out relatively easy compared to the drive shaft seals. Once they were out I smeared a little bit of grease in the housing to help the new seals slide in better, and also greased between the seals. I set them in one at a time using a socket and lightly tapped with mallet.
Parts #40 & 41 shift rod busing and shift rod seal. with the water pump, drive shaft, and shift rod removed I turned the lower unit upside down and used a small long socket to tap the busing out. Within the bushing there is a seal. For reinstallation simply flip the LU back over and repeat with a larger socket. Becareful not to hit to hard as you will damage the bushing
Part #39 Drive shaft seals These were a little tricky at first. I had to rig a kind of pry bar to get these seals out (I will add picture later tonight). With the lower unit in a vise I used the pry bar to grab the inside of the seals. Very carefully (not to damage and drive shaft bearings) I placed a long 1/2" socket extension up the bottom of the LU and slowly tapped on the back of the pry bar. I have heard of people using a small puller but I did not have one handy at the time.
Those were the three seals that gave me the most problem and that require "special" tools to remove. The toughest part of the whole project was getting the water tube and shift rod lined back up to reinstall in the exaust housing. It took a small mirror, iphone flashlight, and pregnant wife's assistance to get everything lined up. If someone knows an easier way than that PLEASE LET ME KNOW!