Hi
i don't have Tracy's newest book (solving problems one), but there I am sure Tracy will have written detailed 'instructions' on her method called pick up put down for helping children to sleep independently. Tracy did not believe in letting children cry it out as it breaks that balance of trust between child and parent.
I remember one part of one of her programmes where the child was settled to sleep in the parent's bed and moved while asleep. (this child i think was also a bit older like your son) Of course when the child woke up they were in a different place and bewildered as to why they were there. Imagine falling asleep in bed and then waking in the middle of the night in the garden!?
Please can I direct you to the pick up put down board (also on the sleep forums) for more ideas on how to help with Tracy's methods.
Sorry I can't give any practical ideas, but the ladies here are AWESOME!
Alex