As others have mentioned, you can expect a lot more speed to start with. You will see this right away as the plane picks up speed rapidly and streaks down the runway. Then when you go to make your first turn the plane will appear to have instantaneous response to your smallest stick inputs and the plane will turn very quickly! Coming off a trainer which has laid back responses, this fast response time will probably take you by surprize for a few seconds and you could find your self overcorrecting. Hopefully you will have enough stick time to realize what is happening and make small smooth stick movements to regain control the plane. If you don't have enough stick time, then the plane may be in trouble!! Thats why I suggest that if you can, buddy box the 2nd plane for at least the first flight. Some instructors are too busy with newbies to be bothered with 2nd plane flyers but if they have the time, or don't mind then go that route. The other thing you will notice is that the plane will be much easier than your trainer to fly and land in windy conditions, especially if the plane is a low wing. The plane won't flair as much or at all if a gust of wind hits it when landing, it may slow down for a second and then just keeps on coming down at a nice steady rate. Once you get used to the quicker reaction time and the predicatble flight, you won't want to go back to high wing flat bottom trainers!