EVAP Error Code

Hello, my name is Keith Mitchell and I just got an error code reading from my vehicle "P0453" and it said something about a high pressure from the EVAP system. From the research I have done it could be a faulty sensor or a leaky connection due to worn out O rings or a few other things and the repair cost could be upwards of $300.00. I was just wondering if there was a cheaper alternative doing it myself and if you could give me a few things to check myself before paying so much for a garage to do the work?


Thank you!