Let'er rip!!! It's yours with perfection or imperfection. I know from experience, I was alot like you and still am to a degree. Every single quilter started somewhere and WITH mistakes! No quilt police here that's for sure. You can always get a block sandwich and do a test run on it before you actually start quilting. I still do that. Someone else will see it with much beauty even you can spot your "flaws". You will do just fine!!!! Post pics when you do!
Happy Quilting!!
Monique