The most experienced lady in our mother/daughter knitting group was always able to help us with our mistakes. Her comment was,"Well, I've made them all, so I had to learn how to fix them."
I thought it was kind of funny till I started knitting more and more stuff....and making more and more mistakes...but just like she said, I learned how to frog and put things back together, and how to make mistakes... and how to avoid them in the future.
I really think those of us who make the big mistakes and survive are the ones who are the more fearless knitters--the ones who make scarves for 20 years because they don't think they can do more are the ones who haven't learned that mistakes aren't fatal!
All that to say...keep on and you'll figure it out. And the next one will be even better for the experience!