Using a mini keg with a regulator is much easier to use than traditional kegerator system. But if your used to the taps in a growler bar or a home tap system you have to change the way you look at things a little bit.
Normally the lines are under pressure, usually 12 psi, then with 5' of beer lines you create enough drag to serve the beer at approximately 5 psi. Serving rooms maintain this perfect balance with several methods of flow control to serve you a perfect pint every time.
With a mini keg there is no beer line, just a dip tube and straight out the tap, so you want to release all pressure from the keg right before serving. When you get your keg home let it sit in the fridge for at least a half hour to fully chill and settle down from the shaking of getting it home.
After settling you can snap on your tap and regulator making sure that both are in the off position.