How does one handle busy days?

My new consulting business, Adeptware, is in its second month and today I got slammed. Phone calls and e-mails with potential clients, a trip to the bank to get my new DBA forms copied for my accounts, an evening planning session with the calendar, installation of a new domain name and web site for a client, etc. My rhetorical question is this: how does one handle such days? A day with barely any time to breathe. A day in which I’m happy to have new business, but wondering how to fit it all on my calendar. I don’t expect an answer. Tomorrow will most likely be dead, except for the Ruby Meetup which I’m hoping will be packed again like it was last month. I’m beginning to think that’s just the way it goes for us self-employed chaps.