Excellent information and very wise advice @sme
Myself, I worked a full time job and focused my free time on my hobby that turned into a business. I did not quit my career until my business was covering my own expenses.
Once you go into business on your own.. don't let the fruit of your labor fool you as nothing is guaranteed. Put some money away for 3 months for those just in case moments like...
Getting sick.
Accidents that do not allow you to work.
New family members etc..
Economy yo-yo
Idea is, once your self employed your on your own for the most part. It's why you went into business.
At times, in the past.. I thought to fire myself for be too lazy ;)