Lesson: don't be afraid to brainstorm. Write everything down to be organized later when you feel motivated + inspired. Creativity isn't linear.
I still love this name so much, in fact, that now when I'm feeling ready to buy my domain name and it is already taken (!?!?!) I feel quite offended. Even though I know I shouldn't because I should have bought it back in 2010 when I first learned how to buy domain names with GoDaddy. But fear held me back + now I regret it.
Lesson: don't be afraid to buy your domain (you can always let it expire).
Lesson: Treat your biz like a business. Create all your biz elements right away + polish them later.
I guess the take away is don't be afraid to jump in head first and get started. I'm not saying quit your job + take out a loan against your house (unless you've already run the numbers and know it'll pay off), but if there are small investments you can make to show that you + your biz are serious, it's worth paying for in the beginning. Don't wait to gain a following only to find out your domain name/unique niche market is taken.