Also, don't underestimate the value of making sure a client is happy. My first client required little more than setting up a WordPress theme and doing some design tweaks. I bent over backwards for them, and now about half of my clients are referrals from that first client.

I'm not saying that you should do everything for everyone, because some people will be unreasonable; when you're first starting out it's probably in your best interest to be a little more flexible.