If you care even just a bit about your computer

That makes it sound like as if he could damage it that way.

And "pay a professional" may better be saved up for reinstalling Windows. That's what most may be limited to do anyway (to avoid questions about Linux).
A lot of businesses will only use and provide products where you can blame somebody up the chain (in this case Microsoft).

I've started with same amount of experience, if not less. I got a laptop, and didn't like what was on it. So I wanted to try Linux. My experience was so low I spent hours searching for "just plain, original, unmodified Linux".
Anyway, in 2 days it was running Mint without issues. But I almost got turned away by some bad "newbie" guide that shown CLI-based partitioning as part of Mint installation. Meanwhile I didn't even know what a "partition" was.

And eventually I went through the typical pipeline, Mint -> Manjaro -> bidurnal distro-hopping -> Mint -> Manjaro -> Arch