Taking apart your Whirlpool 29 inch electric dryer is the first thing that you need to learn to be able to do the repairs yourself. Once you learn how to do this properly, doing the repairs will be very easy.
If you need to check the timer, the temperature control or the push to start switch, you will need to know how to remove the controls back panel.
To check the heating element, the operating thermostat, the thermal fuses and the safety thermostat, then you need to learn How to remove the back panel to get access to these parts.
To check & replace the door safety switch, you will need to know how to open the top panel.
To be able to check & replace the motor, the drum support rollers, the belt and the idler pulley, you will need to know how to open the top pane, the front panel, the belt and the drum or tumbler.
I hope that you realize how important is to know how to dismantle the dryer properly.
Click on the video below to see how this is done.
Below are the links to the parts needed for this repair.