It appears that your timer is failing. The process to remove and replace the faulty timer is relatively easy to do with just some simple hand tools.
You should unplug the washer from the wall outlet before taking the top backsplash (control panel) apart. There are screws on the backside of the control panel, that you need to remove the back panel. Doing this will let you get to the wiring plug connector on the timer motor.
You'll also need to remove the timer/cycle knob on the front of the panel so you can use a socket (or a adjustable wrench) to remove the mounting nut and lock washer that holds the timer to the metal panel.
Once you have everything loose and accessible, all you need to do is unplug the connectors on the old timer and out them on the new timer and reinstall the lock nut and washer and button up the panel.
That shoud be all that's needed to get things working again.
Here's link showing a drawing of your washer along wtih the parts list (and prices) for parts.
The timer is part #134378400 and costs about $89.00
Hope you find this Very Helpful and best regards!