Thanks Jon, it does give some guidance but isnt as good as the excellent guidance given in the UK Digital Photo Magazine CD in August 2012. Hunting around, I did find http://download.photoshopelementsuser.com/LC/LearningCenter11/LC11-RefineEdge.mov which is clearer, although in this case it shows selecting the background, not the person (just select the person if you want to cut them out instead). In the DP magazine it suggested doing a reasonably precise cut out with the polygonal lasso tool, doing the best you can around hair, then refining it with the refine edge brush. The results are excellent!
My main reason for posting this was to get Adobe to put something in help on this topic. What good is it introducing a new feature in Elements then giving absolutely no guidance on how it works?!