Is it difficult to do...esp for seniors? Not sure my hub would like it, or could do it.
Nah, it is easy.
Before switching, you can always do a simple test and use a USB thumb drive to do what is called a “live boot”. That will give you the opportunity to see it working on what you have without making any changes. Live booting is non-destructive.
The only difficult thing is doing your data backups - which you really should be doing anyways so it’s non-Windows/Mac/Linux specific. Anybody anywhere will tell you that, make copies of the important stuff.