Start with your normal line and then adjust off of that. You should never line-up off of someone else. There are so many variables involved. The best you can do for yourself is to take every shot you make separately. Don't dwell on bad shots and don't get too excited by good ones.
Consistency is the key to bowling for a high average.
They are poor fundamentally and don't make spares or lose their concentration. In order to compete and get better, you must understand that the lanes are changing constantly and that you have to adjust your game to fit. Remember that emotions are not necessarily a bad thing. Many bowlers rely on the adrenaline rush to bowl good. You should not make that the only factor in a good bowling game.