I don't calibrate. I figure if my clients can't tell the color off why does it matter?
Ok, so I am mostly kidding! Although I do wonder. Most people think their 100 dollar home printers make "great prints" so.... whatever.
I just took a bunch of different examples of prints and had my lab print them and compared them with what I was seeing on my monitor. My lab tends to print on the green side. The downside to this is that if their equipment changes or if my monitor shifts a little (that happens) then they are no longer calibrated. If you don't want to take time to worry about all this and don't want to get it wrong then have your lab do the color correcting for you. You will pay more, but prints that look great are worth it. Keep up good communication with your lab (that's why a local lab is a good choice). You may prefer your images warmer or cooler than what they do, just let them know. A good lab will keep notes about your account and what you prefer.