I agree. It's a pretty simple. CO2 pressurizes the keg, you open the faucet and the pressure pushes beer out.
The only times my system has ever not poured is when hops or a mesh bag got stuck in the dip tube or the CO2 tank was empty.
I would invest in a couple of spare QDs (quick disconnects). You can never have too many and the spares are handy to run cleaner or sanitizer through. I have also heard mistakenly swapping the gas and liquid QDs can damage them but I have done it and they still work.
Most ball lock kegs have a slot cut or dimple in the handle of the gas in so you can find it under bad lighting like in a bar. The few I have that do not, I labeled with a Sharpie IN/OUT so I don't screw up. Another helpful reminder is grey=gas black=beer. Keg lube or just dunking the QD in water first make them go on easier.