Replacing power Side-View Mirror (Driver's Side) on 1999 Dodge Intrepid

I have downloaded some instructions for this job and all of them say I should "Disconnect negative battery terminal before removing door panel".

Is there an easier way to disconnect the battery for this job other than going through all the hasle of getting into the battery compartment just to disconnect power to work on the mirror?

Asked by for the 1999 Dodge Intrepid