You don't have to go into all this complication unless you really want to.
I'm not computer literate, but I upgraded my Win 7 desktop to Win 10 without the slightest problem and free of charge too.
My FSX and all its add-on's survived the process and works normally.
Having had a couple of weeks to get used to it, I now like Win 10 so much that I've upgraded my laptop from Win 8.1 to Win 10, again free of charge.
The motto is: Be bold, take the plunge, but back up just in case! :)