D.N.
Clean myself. Cleaning the dryer is very easy. All you have to do is take off the back--or front if that is how yours is made. Then clean any dust and lint. Also check the belts. Those are also very easy to replace. A burnt smell could be a belt rubbing. If it has to do with the motor, then I would call someone in. There are also a lot of videos and how-tos online. Just google "how to clean my dryer". I think ehow has a good one if I remember correctly. Also be sure to use a long brush to clean out the vent systems and hoses.