It is perfectly normal to be nervous when buying a house, especially if it’s your first house, AND considering what we’ve been through with the bubble, you’d be crazy NOT to be nervous.
You’ve been around awhile and should know your market pretty well. If you think you’re getting a decent deal, and if it’s perfectly affordable to you under various, negative circumstances (loss of job, medical emergency, etc.), then you should relax and enjoy the buying process.
Congratulations on your new home. Hope escrow goes smoothly, and that you enjoy your home for many years to come.