In order to shave your arms with an electric shaver especially for women, the first thing to do is to choose an electric shaver which is water resistant. This is because you will apply shaving cream to your arms.
Below are the steps that I found from eHow.com on how to shave arms which I have simplified to 5 steps when using an electric shaver.
Soak the arms in warm water for 10 minutes to soften the hair and to open up the follicles where the hair will stand up resulting in a smoother shave.
Apply a thick layer of shaving cream on the arms and allow it to sit for 5 minutes to soften the hair and skin for razor burn prevention.
Shave with light pressure in the direction of hair growth and keep the shaver at 30-degree angle to your arm.
Once complete, rinse the arms and pat them dry.
Apply a dry or sensitive skin lotion to the arms to prevent redness and irritation.
Feel free to provide better tips on how to shave arms with an electric shaver in the comment section. Thanks.