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You will need to turn off the water.

There is normally a valve inside the meter box (sometimes it is buried under soil) Sometimes it is outside the box. It will require a tee shaped tool to close and open. Home Depot sells them. Find this first before you do anything. Make sure it opens and closes.

I would do everything (everything, except backfilling the soil) before you disconnect from your existing line and reconnect. This way you are without water for only a very short time, that way you keep the wife happy.

Depending on your age, you may want someone else to dig the trench for the new pipe, or rent a machine. It is hard work and can lead to health issues if you haven't been exercising regularly. Good luck.