The internet has several good pictorial and video resources on how to change your own motorcycle tires.
Best Advice to a newbie: Buy yourself a good set of tire irons (several different lengths) and use lots of liquid dish washing soap as your mounting lubricant. Use a large "C" clamp to break the bead on your old tire, it's easy and you already own the tool. Have a friend handy as a second set of hands is often needed on a stubborn tire.
Be careful never to exceed like 60-70 lbs of air pressure when first inflating (popping) the bead on to the rim -- if it won't go, deflate the tire and loosen and
relubricate the bead with more liquid soap.
THIS IS A SAFETY ISSUE -- DON'T EXCEED 60-70 psi AIR PRESSURE !!!
If you have a section of bead that just will not pop on to the rim, then GREASE that small section of rim with bearing grease (just grease the small stubborn part, the rest of the ungreased bead will grip the rim during acel/decel until the grease can be completely absorbed by the tire's rubber compound)
PAY CLOSE ATTENTION TO SCUDMAN -- HE HAS GOOD COMMON SENSE
Using basic hand tools and not much else (#1 of the SCUDMAN how-to instruction series)
http://www.youtube.com/watch?v=0Pfp2Z9k0n0&feature=PlayList&p=BFD70FC8864BFBE...pictorial version
http://www.clarity.net/~adam/tire-changing.htmlseries of short videos from the Brits
http://www.ehow.com/videos-on_523_change-motorcycle-tires.html