Short Sales!!

I know a lot have change in real estate investing world over the years. What adjustments had to be made with short sale now days? Do you guys handle the negotiating yourself (short sale specialist) or does a lawyer or agent have to handle the process. With closing on short sale if I was to flip to a investor do I have to use transitional funding to close the A-B deal? I also heard that you have to sit on the property for 90 days until you sale it. What are you guys facing today with short sales?

Phil Mahonie