Hi there. with enough Googleing/researching questions and issues, plus reaching out to JAWS users, I think you may find the learning process easier then it might seem at first.
Remember that you don't have to try and learn all of the random features that JAWS has. Honestly, I think it has way too much going on in it's settings, at least for my specific needs; even though I have been using it off and on for over a year now I am sure I do not know what half of the settings and random features are for. Voice Over on the mac is much more basic, compared to windows screen readers, but I don't think most users have a mastery of all of it's settings and features either, which is not a bad thing. Most users have no reason to use the Voice Over commander to remap hot keys so they never have to move their hands from the home row and are therefore more efficient. yes, this is something I actually did when I was a mac user.
So just remember, poring over JAWS documentation and audio help files is a good idea, but you don't need to know a lot of the available features to become a decent JAWS user. Honestly, I think the OS of windows itself offers a steeper learning curb then jaws, when it comes to switching from the mac. Even though I love windows now, there are a lot of things about it's file system, settings, apps etc. that are odd and inconsistent, and mastering these idiosyncrasies takes time and patience. Once you get the basics of the OS down, Windows Explorer, the desk top, ribbons, the start menu etc. the JAWS part should be much easier, I would think. The experience of using most screen readers in web browsers is pretty similar, with some variations in feature sets of course. Apps can be pretty unique and take some poking around to get comfortable with, just get ready to do a lot more tabbing and shift tabbing instead of using the arrow keys as much. The different cursors you have access to with JAWS can be hard to get your head around, but you won't need to mess around with them too much in most situations; I think this is a very good topic to read documentation about. Read this page if you have not already, it's the first thing that came up when I googled JAWS and cursors just now.
$1I really think the main thing you need is just a lot of hands on time and experience. I was a hard core Mac OS user for the first 7 years of my life as a blind person. Despite receiving JAWS training at multiple training centers I never spent much time with it or windows, and I never became comfortable with them. I believe this was because I never used windows in my day to day life, I would only boot into windows during training classes, or when I needed to do one specific task, which is not a great way to become a competent user of anything. However, at one point I was in between jobs, changing careers and I knew I would need to learn Windows for my next job. I finally decided to stick with windows and learn it properly. I decided to only use Windows for a month, booting into Mac OS only when I had no other choice. After a few weeks of using Windows every day I never looked back and I am now exclusively a Windows user.
I do not want this to become a, screen reader vs. screen reader thing, but you might also try NVDA. Personally I find it much simpler to get my head around, and it is my primary screen reader. Either way it's always good to have as many tools as possible in your tool box. Feel free to ask any questions yu have about specific areas; there are lots of very knowledgeable people on this sub reddit.