Repair of Sharp Carousel Microwave Model R4A58?

This morning I wanted to heat a cup of water for instant coffee and when I turned on the one minute button the microwave started then stopped immediately. All of its lights went out and it hasn't worked since. The unit is approximately 10 years old. I noticed that lately it has been vibrating more than usual when it was turned on. I would like to repair it myself, but don't know where to start. If I need to send it out for repair I am sure it would not be worth the cost.