It's worth the trouble
I changed mine to a dripless 2 years ago, and it has performed flawlessly. There are two bumps in the installation. The first is removing the coupling half attached to the shaft. Use a shaft like piece of steel (like a sacrificial socket slightly less than the diameter of the shaft) and place it between the coupling halves exactly dead center. Have a selection of nuts and bolts long enough to bolt up the coupler with the steel piece in the middle acting as a pusher on the propellor shaft. Tighten the bolts, going aroung the bolt pattern half a turn at a time. This even pressure will drive out the shaft from the coupler, no banging, no fuss. If you don't get any movement, stop, you are not seated in the center of the shaft and will break something. You should have just a little bit of movement with each full circumference tightening sequence. Put a piece of tape on the shaft at the entry into the coupling for visual reference of movement. Also, that will tell if it goes back in as much when you are done. The second bump is the shaft itself. It must be straight, and between the new dripless seal and the coupling half it must be smooth without dings or irregularities. The dripless shaft seal is really two O-rings that slide very tightly with lubrication down the shaft from the coupler end. Just a simple ding or burr in the shaft will cut the O-rings. I took this opportunity to remove the shaft and take it to a machine shop. First I wanted to measure the shaft for bends and then have them smooth it. Since the shaft had a small S bend in it, I opted for them to make a new Almag shaft. Less than $150 for a 1" x 72" shaft, machined and fitted to my existing prop and coupler half. That was a no-brainer. I was so impressed with this machine shop I'll dig up the contact information if you would like. They're in Norfolk, not too far from you to work with. Ask on this post or email me. All of this is in the well written directions that are provided with the dripless device. But at least this will let you know it is certainly achievable, and worth it.