Congrats Egret! As far as the sextant goes..My thought would be that You need to use the sextant frequently enough to stay in the ritual of things that you probably want a basic metal frame compass
like the Celestaire Astra IIIB instead of a plastic Davis 25. Don't get me wrong, I know there are many that have had very good luck with the Davis, but if your using this crossing the Pacific, I don't think the cost difference is all that significant. I am the lowest common denominator on celestial Nav. If I can teach myself using all the magic of the internet
anyone can. The used book that I picked up as a tutorial was "Celestial Navigation
by Star Sights" by Hewitt Schlereth. There are plenty others. One thing that cost me a little time in my learning curve was bouncing around from internet
site to site and being confused by the small differences in worksheets and even terms. This was especially apparent when I was seeing how electronic "Apps" for almanac and sight reduction compared to paper info. Try and get through one authors whole course before being distracted. Make a bunch of shots and get your confidence up. My thought would be to stick with paper worksheets and almanac till you master the principles. If you are not concerned with the zombie apocalypse, the software
you can run on your phone
is truly amazing.