1) Find the time you work best (like Leovenous, mine is the early AM), 2) get a comfortable chair, nice monitor, kb, and mouse, 3) As Mike Boyink said, get out of the house on occasion.
I live in Austin, actually Cedar Park, and there are plenty of places that offer free wi-fi if you have a laptop. I recently got tired of my old laptop that would only last 45 min on battery by picking up a used Macbook Pro for about half the price of a new one. It isn't the latest, but it allows me to work "offsite" when I want to get out of the house. Let me know what part of Austin you live and we could meet up, if you need an excuse to get out of the house
Oh, and a bonus: 4) establish a 'closed door' policy with the family - if the door is closed, please don't interrupt unless of a fire or loss of limb. I have a 5 year old that understands that now