http://stevespages.com/pdf/s&w_39_59...539_559_52.pdf
Charlie,
Try this link. this is the manual that should have come up. It is a little hard to read on page 5, and this is a later manual and does not mention bushing. Do pay attention to not letting the hammer fall when pulling the slide off. The barrel does come out the rear of the slide, and when reinstalling, the key is to get all the levers down under the slide. I use the handle of a toothbrush to push them all down at the same time as the slide hits them.
Great gun isn't it? Post some pictures!
Gary