In most cases, removing a crank requires the use of and 8 mm hex key and a crank puller. Some self-extracting cranks need only the 8 mm hex key. Older cranks may need a thin 14 or 15 mm wrench.
Removing crank arms isn't too difficult. I think it's a good idea to use a torque wrench when reinstalling them. They need to be torqued down pretty tight (30 foot lbs or more).
My suggestion: take it to the LBS. Let them pull the crank for you, and reinstall it. But get them to show you how it's done, and then buy the tools for yourself.
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