Also, if you don't have one already, order one of these
http://pricepoint.com/product812.html
and one of these if your current cranks have square taper bb to remove them:
http://pricepoint.com/product811.html
Make sure that your new cranks come with a "one-key release" crank bolt so you won't need another two crank pullers.
Removing and replaceing cranks/bb isn't too hard, just make sure your new bb is the same thread as your old one, and ask to verify your new vs old spindle width won't affect your chainline.
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger