I changed the fuel filter on my 2005 Cadillac STS in under 20 minutes. My car had a slight hesitation but still had power, after the filter change she is smooth as ever. The Cadillac SRX is pretty much the same steps.
Fuel filter http://amzn.to/2hSakdR
Fuel filter disconnect tool http://amzn.to/2iIZ0xT
Spark plugs http://amzn.to/2iROoS9