good for you! If you've got the brake open and have released the QR on the wheel skewer (plus maybe a turn or two if it was really tight) there should be nothing holding the wheel on - except the tires not passing through the brake pads. Especially if you have fattish or knobby tires and the brake pads were adjusted close to the rims. Just let out some air and try again, squeezing the tires together with one hand to ease them through the brakes.
If this is the rear wheel there's a bit more wiggling to do because of the rear derailleur, but do have the lbs show you how to do it.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett