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Sit in a chair that is a comfortable height for the height of the table. Arrange the machine so that the needle end is on your left and the body of the machine is on the right. You will be checking a couple of things first and getting to know the machine a bit, so don't plug it in just yet. Many sewing machines have a built-in light, which is often a good way to tell whether there is power to the machine. The power switch will usually be on the right side or back of the machine, if there is one. Some machines don't have a separate switch, in which case they're turned on as soon as they're plugged in. Plug the pedal into the machine, too. Place the pedal in a comfortable spot under your feet.

Summary:
Place the machine on a sturdy table, desk, counter, or sewing cabinet in front of you. Plug the machine in and turn it on.