Wait...what?
Before I even broke out into freelance consulting I hired an accountant. When starting your own business, I would think it's base-level knowledge that anything with legal ramifications (and that includes the IRS) should be handled by a professional.
Get an accountant. Get a lawyer (at least for one day to draft up your documents and make sure your business is set up or even use LegalZoom).
And within the first month of breaking out on my own, I must have read like 3 or 4 books on freelancing/consulting, 10+ blog posts, and podcasts.
True - no one is going to act like Clippy and say "Hey looks like you're starting a freelance career. Have you considered an LLC and liability insurance?"
But - do people not try and learn about what they're getting involved with anymore? Starting a business, even if it's a 1-person sole proprietor consulting firm, is a big task. And yes, davidscolgan is right that you should consider all business aspects beyond your primary skill. But it seems almost irresponsible to say that starting a business is going to be a huge shock. No one is going to tell you, but even a cursory search online will give you a torrent of information on freelancing, consulting, and starting your own business.
If I hadn't put in the initial legwork into studying the consulting landscape there is absolutely no way I'd: (A) still be consulting or (B) make nearly as much money. But the answers are out there. And yeah - get an accountant, it will drastically simplify your finances.