Great to hear from you. I have an Oyster 39 Ketch made in 1981 and the longest passage we have done so far is Inverness to Copenhagen, but I too hope to cross the Atlantic in her some day. I have also done St Lucia to Bermuda in a bigger yacht. I actually did the RYA Yachtmaster Ocean shorebased based course in the 1990s. The instructor had crossed all the major oceans several times but taught from her bungalow in rural Oxfordshire. She didnt like theory, but relied on mnemonics to know when to add or subtract, but she knew the navigational stars like old friends and could name them from a glimpse through the clouded sky in her garden. I am sorry I cannot remember her name. I didn't take the exam - I didn't have a boat then either.
I actually do want to get the Yachmaster Ocean qualification now, and partly as it is lock down, and partly as with RYA exams it helps to know "their way to do it" and also as I find it much harder to put celestial navigation in practice at sea than I do on land, I just signed up to do RYA Yachtmaster Ocean Shorebased course with Navathome.com , who have very well regarded on line courses.
If Greg or anyone else undertaking the same course right now wants to talk about it please feel free to contact me off list on my gmail which is billlionheart (or google my work email at Manchester if you like).
Welcome also to Navlist, which has a rich history of discussion of everything related to traditional navigation and it is well worth searching the archives. There is a wealth of experience among our members of both maritime and aeronautical celestial navigation, practicals and theory. If there is some practical advice to all those learning celestial navigation during lock down start taking sun sights with your oven tray or bucket filled with water and any improvised sextant and whatever view you have of the sky from your current confinement. It all makes so much more sense when you try to do it!