Handling difficult questions. It is important not to start responding to a difficult question before you have thought about the answer. Repeating the question and asking for clarification will help create some space for your thoughts.
Make sure all loads in vehicle are turned off, key is in the off position. Disconnect the negative battery terminal first then the positive terminal. When installing the new battery connect the positive terminal make sure not ground out the tool your using while tightening the positive terminal.
Hope that helps and best of luck.By the way on most of the older vehicles for example 90-97 etc you can disconnect the battery for a few minutes without any headaches but on many of the newer models the dealership may have to reprogram the whole ignition/stereo security and alarm systems.