One thing you may want to do that I left out is to scale down the UV layout slightly.

Before saving the UV face layout place the cursor in the UV Editor window.

press the A key to select all the verts of the layout

press the S key and enter .95

This will scale the entire UV layout down to 95% of the original and give you some space around the edges of the UV Map when you save it. Just makes it easier to work with the map in an image editor.

Now with the auto unwrap the various UV islands are placed randomly where the program finds space. There is a way to find out locations on the model for the polys but it's a little tricky so we'll leave that alone for the moment unless you want to learn right now.

Anytime you have a Blender question send me a site mail and I'll answer or point you to someone that can.