What should I expect when trading in my car that is worth more than the car I'm buying?

I am trading in my current car to buy a 5 speed because I hate driving an automatic. The car I currently own is marginally more expensive than what I am wanting to buy so I am wondering if a dealer will try and screw me out of a couple thousand dollars (suggested retail/trade of my car is $4000 more than the purchase price of the car I am wanting.) What normally happens in these situations?