What Do I Do Now?

After much thought, maybe not enough, I signed up for a Twitter account today.  Yep, I’m on Twitter, and I am totally freaking out now.  In my mind I’m thinking “What do I do now?  What was I thinking, I don’t know how to use this thing.  Why? Why? WHY?!!”  and so on.  Ever had this sort of reaction when trying something new?  I don’t really understand it, but I think it’s because I am looking at “the big picture” instead of all the smaller bits.  At first glance to this beginner's eye, Twitter looks like something incredibly huge and complicated.  I just need to break it down into smaller details, learn how to do it bit by bit.  I’ll get it eventually, I hope.