oven door help

My oven door no longer closes all the way. The light stays on and you can feel hot air escaping. Tried to take the door off based on the instructions (it was supposed to come off easily) and it would not come off. There are no obstructions in the way and the gasket appears to be intact. For the price it is going to cost me to get a repairman out here, I can almost buy a new oven. Can someone please help me???