I bought the first two books in a "Self-Publishing Empire" series. The author did strongly suggest incorporating and publishing under that business entity. Mostly for tax purposes but for some limited protection as well. I've done so (actually an LLC), but down the road I intend to do more than write, so I'm planning ahead. And yeah, hiring an accountant can be costly, but you'll probably get enough tax breaks to offset that cost. Assuming you even make any money at this--I don't expect to turn a profit until many years have passed, unless I get really lucky. I do anticipate book covers and editing costs, so I'll have monies spent to claim. We'll see how that affects things.
I've also recently read advice from an author's legal handbook that says incorporating doesn't really offer all this supposed protection and doing taxes isn't that hard if you're running with a DBA (doing business as).
So it depends on where you think you'll be in a few years. A hobbyist just having fun, or an authorpreneur intending to fund your way into early retirement. You can always bounce between incorporating and not, so don't feel like one way or the other is constraining. I just decided to lay some groundwork while things are quiet, and keep my fingers crossed.
Sadly, the self publishing empire series seems to have come to an abrupt end. I think the author may have passed.
Here're some linkies:
https://www.amazon.com/Entity-Set-Up-Bu … s9dHJ1ZQ==
https://www.amazon.com/Self-Publishers- … amp;sr=8-4
Hope this helps!