Go for it! I look at each project as a snapshot of what I'm capable of at the time. You will learn something from every quilt, and eventually, you won't get nervous when it's time to start quilting. (I still get a little nervous when I start cutting the fabric for a new quilt... especially if it's quilt shop fabric at $10+ per yard.)
Enjoy the process, learn from mistakes, and don't require perfection of yourself.