1998 Chevrolet Cavalier Rear Axle broken?

I took my `98 Cavalier to the shop because I replaced the rear tires due to uneven ware. The tire shop stated that my rear alignment was out and referred the shop to take it to. At the shop, they had the car up and was getting ready to set the alignment, but come to find out that the rear axle is broken. Is there any step-by-step manual that I can use to take the rear axle off and replace it? I was thinking of going to the junk yard and get one there.
Please help.
Thank you
John