That's awesome, knowledge really is power. Self doubt is normal, and i believe it can help us be better teachers. Just think of it like this -
When we experience such doubts, we do more research, try different techniques, ask for assistance, etc. Whereas most PS teachers have all the confidence in the world, rarely experience doubt, and more often than not fall into a pattern of repetition (just think of how many teachers teach the same for decades). Maybe if they experienced some self doubt they'd improve too?
I just reviewed the Homeschool blogs suggested through this forum.
Here in Georgia, parents or the person a parent selects to do the homeschooling must have a HS diploma or GED. It is written into the law that way. You should just check into the state in which you reside.
Goodness No! I dropped out of college to start a family. Many people are not fully educated on homeschooling. I've had people tell me I need to be "certified" (whatever that means!). One of the most importants tools to have is full knowledge of your state laws. Most states have very reasonable laws.