I'm very often asked whether, as a homeschooling Mum, I am a qualified teacher. My reply is usually along the unpopular lines of "I believe every parent is qualified to teach his/her child". Which is usually met with a blank stare, followed by a polite if not bewildered "oh".
The truth of the matter is that I am a university dropout who wasn't particularly academic at school. I put in the effort, but didn't get the grades.
Since I started homeschooling I've realised how much I don't know and how much of the drivel I was taught at school was incorrect, hypothetical and (in my opinion) stupid! Homeschooling is like being given a second chance at learning. Even though you are the teacher you are learning and revising at the same time and it's a wonderful thing. It makes me a more effective teacher because I am a genuinely interested student.
If you have considered homeschooling but don't think you have the smarts I recommend to give yourself a chance, and with the right resources and attitude, you can do it!