If it helps, my chickens site is successful enough to be in SBI's top 500. I knew nothing whatever about websites or building them, nor about running an online business, when I started and I never had outside help. So you can take a look at that - [Domain Private]
But I echo what Help Elf said - it takes time, patience, a lot of work and a real passion for the subject and for developing it as a business. But if you give it that, it can take you far. From knowing nothing I not only have a successful business, I learned enough from the Action Guide and the forums that I'm now actually employed by SiteSell, which to me is amazing!
I also echo what Dee said - take a look at some of the SBI! reviews. They're all amazing, and most people were in a similar position when they started.
And finally, I echo what Debs says! Although I've never had any Pros' help before, I've just paid to spend some time with a specialist in one area so that I can improve beyond what I already have. That's the great thing about Pros - they're brilliant no matter what level you're at.
I wish you every success in your SBI! journey.