Dryer was getting very hot

I watched videos so I would know what I was doing. Well No, My thermostat was in the front of the dryer. But after a little blood and sweat, and I am not kidding, I got the front off. I ordered my new part. Finally got it in Spent $40.00 and it still doesn't work. I know it was the right part. I checked all the trouble shooting web site. That was the only thing they said it would be. Friends advice tell me it is the brains of the thing and I need a new one. Well not 2 weeks before Christmas. Thanks for asking. Single hard working mom.