Check out this website, it helped me with a situation with a debt collector, now I have a lawyer, due the collector breaking some of the rules that they are required to go by.
http://www.budhibbs.com/First.htm
My lawyer is countersuing the "law office" that tried to collect on a debt of mine, while I was in the verification stage, which they are required to complete. They have not been so mean to my lawyer's staff since he knows that I mean business.
Hope this helps, it's not exactly about repossession, but I would think that a lot of this would still apply.
Scott