Here are the steps to replace a bathroom fan light combo:

1. Turn off the power to your bathroom using your circuit breaker panel.
2. Disconnect the wires from the old unit.
3. Remove the old unit from the side of the ceiling joist.
4. Get the new exhaust fan and light according to the size of your bathroom.
5. Clean the space on the wall.
6. Set up the new fan and light.
7. Connect the wires.
8. Turn the power on and check.

You can find more detailed instructions on how to replace a bathroom fan light combo in this [step-by-step guide](https://kitchenstaraccessories.com/how-to-replace-a-bathroom-fan-light-combo-a-few-beneficial-steps/) from Kitchen Star Accessories.

I hope this helps! Let me know if you have any other questions or if there's anything else I can help you with.