2002 Pontiac Sunfire P0440 Check Engine Light: How to Diagnose and Fix Emission System Issue

My 2002 Pontiac Sunfire has experienced a recurring check engine light issue, previously resolved by tightening the gas cap and ensuring the fuel tank is at a semi-full level. This pattern has repeated over the past six years, with each instance being fixed through proper gas cap maintenance. However, this time the check engine light has remained on for two weeks without resolution. The OBD2 diagnostic tool now reads code P0440 — indicating an issue with the Evaporative Emission System (EVAP). While I’m considering taking it to a mechanic, I’d like to perform a basic inspection myself to better understand what might be wrong. I’m particularly interested in locating and inspecting key components of the EVAP system: the fuel tank vapor hose connections and the EVAP solenoid valve. As a female vehicle owner, I’ve sometimes felt taken advantage of when visiting garages — being able to perform basic diagnostics gives me confidence to communicate effectively with mechanics and avoid unnecessary costs. Can anyone provide a clear, step-by-step guide on where these components are located in a 2002 Pontiac Sunfire? Specifically, the position of the vapor hose lines and the EVAP solenoid valve (sometimes referred to as 'selenoid')? Thanks for any guidance — I want to ensure I’m equipped with accurate information before seeking professional help.