Martienne,
I'm not really a techie, I'm a musician. But back in the early 90's, I could use the MS-DOS command line.
And, in the process of using Linux, I've had to use Terminal (i.e., the Linux command line) a few times.
My observation is that as long as you stay in GUI-land, Linux is pretty similar to Windows, at least in distros like Mint.
BUT if you insist on digging underneath the GUI, well, it's like going to a foreign country, maybe like going to one on another continent.
I think you need to give Linux some time. Dual boot, use Linux as often as you can. Learn something new about it every day.
At some point, you will get "fluent" in Linux. But, like learning another language, it IS going to be a time intensive thing.
Also, be ready for things where there is just no equivalent.
My wife is from another country. I have learned some of her language to speak with my in-laws. A couple of times I was shocked when I asked her "How do you say that in your language?" and she said, "We don't!"
They are just different, and because they are different, they think differently, and say different things. At some point, you have to accept and embrace the differences.
Linux' strong point is for servers, often corporate servers and the IT techs that run them. (Because I spend time here and on Distrowatch, Google Ads now assumes that I am an IT tech and gives me ads targeted to them!
) Windows is such a security nightmare that it hardly ever gets used for servers. Windows strong point is software for the general public. With such different basic markets, you have to expect that in some areas, Linux will be able to do things that Windows just can't... but conversely, sometimes Windows will be able to do things that Linux just can't..... YET!
We have a saying in the US: "If it ain't broke, don't fix it!"
You want to be able to rewrite the boot sector like you do in Windows. Could it be that the reason you need to do that in Windows is because of it's vulnerability to boot sector viruses? To my knowledge, and according to a Google search, a Linux boot sector virus" does not exist.
Since the Linux boot sector doesn't get borked that way, there is no fix, since it's not needed.
On the other hand, one thing I HAVE had problems with in Linux, partly because of the dual boot setups is GRUB.
The ability to repair GRUB might be a much more useful Linux skill to have.... I wish I had it!