I agree about taking it easy the first few weeks. Also I suggest bar-ends for added hand positions because those flat bars give you only one, and 17 miles at a stretch can be tough on the hands and wrists. Or even change out your bars for ones with more hand positions, but bar ends are inexpensive and easy to install. BF has been an invaluable resource for me and my commuting over the last few years. The tone of the forum is mostly helpful and encouraging. Based on your photo you look hale and hearty. Bike commuting will only improve your health, increase your enjoyment of life and extend your years (unless you come down with gear-itis). go Go GO!