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OK, but it's safer to disconnect the negative battery post...just in case your wrench should slip and accidently contact ground.
Wish all readers would take this mans advice, and disconnect the negative post first and on last. Working with the positive post will eventually result in the battery exploding in your eyes or face. Its no harder to remove the negative than the positive but a whole bunch safer.
Kattumaram and Good old Bill are right on the money with this. Please always disconnect the Neg side of the battery first.
When you disconnect the Neg side of the battery you have shut off all juice running through the metal parts of the vehicle. If you disconnect the positive you have shut off the hot wiring but the metal parts of the vehicle still have the neg juice running through them.
For good measure disconnect the Neg then disconnect the Pos side. Then you know you're safe and will not have a battery blow up. Had it happen to me one time, I was lucky and I learned.