If you have a club nearby, and someone is there to help, accept it. If not, since you've flown before, and you're using a trainer, you really shouldn't have any problem.

It's like riding a bike... I don't mean that to sound like it will be easy... You don't "Forget" how to fly, but you DO get rusty!

So don't get cocky. Just take it easy and get your chops back in shape.