Do you want to replace the entire gland, or repack the gland you have now? Mainesail's excellent tutorial appears to cover the latter, not the former. To replace the gland itself, you probably have to disengage the coupler from the transmission, often the hardest part of the job. Once you've done that, it's a "simple" matter of removing the hose clamps from the gland and sliding the unit off the shaft and sliding a new unit on. But as we know, even the "simplest" of jobs on one's one boat can often be difficult. When I replaced my OEM white derlin gland on my H28.5 with a conventional bronze gland, I began the process by soaking the bolts on the coupler with PB Blaster a week before hand. I did this a few more times before actually trying to loosen them. I also tapped them gently with a ball peen hammer. They and the coupler came off fairly easily, but some people have had trouble doing this and have used pullers to get the coupling off. Since I was decoupling the shaft anyway, I also replaced the cutless bearing at the same time. Don't forget to check and/or adjust engine alignment once you recouple the shaft.