You always want to remove the negative battery cable first. Loosen the nut, usually a 10 mm, until you can move the cable on the post. This could be the most difficult part, removing the cable from the battery.
The nut is used as a way to tighten the cable like a clamp to hold it firmly on the battery post. You may need to pry the cable end open once you loosen the nut.
Fully remove and place the negative battery cable away from the battery post. You want to make sure it doesn't have a chance to touch the post or there will still be a connection to the battery.
Once you've removed the negative cable, then remove the positive cable. You should be able to find the Positive and Negative signs on the battery so that you know which is which. Most batteries have a protective cover over the positive cable.
Once you've removed both cables, remove the battery hold down bar and carefully lift the battery out of the vehicle. It will be heavy, so be careful.
Put the new battery in, re-install the battery hold-down bar. Connect the positive cable first and tighten the nut. Install the negative cable and tighten the nut and you're good to go.
I always write down my radio stations before I replace the battery because you'll have to re-program them in after the loss of power.
Hope this helps.
〉 Answered on Feb 2nd, 2008 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines