I'd like to install a timer for my pool pump. I'm thinking the Intermatic T104. I have a main pump for the filter and a booster pump that I only run when using a Polaris cleaning robot. I only want to put a timer on the main filter pump. Right now they are wired with on/off toggle switches. How hard would it be to replace the toggle switch with the timer? In the pictures, the main pump switch is the top switch of the two on the left side of the breaker box. The right side of the breaker box has a 110 outlet and a switch for the pool light. Thanks for any advice!