I started with the front of the transmission but you can also start with the propeller side. My transmission case was extremely dirty and filled with debris, particularly between the case and the oil baffle 74, making it clear that everything should come off and get cleaned.
Next I removed the valve spring assembly. Once you have removed the valve cover and gasket, be very careful when you remove snap ring 35. This holds valve spring 37 in place under a bit of pressure. If not careful, 36 will go flying in the air.