Are you talking about a flight simulator or a real aircraft? In the real aircraft case a continuous lookout-attitude-instruments scan is the key, with the majority of the time spent looking out, primarily in the direction of the turn, integrating the attitude check (AoB and horizon). The instruments (altimeter/VSI, horizon[AoB pointer only], ball and ASI) should be scanned briefly but frequently and changes made to the attitude in response to errors evident on the instruments. Another useful helper is the feeling in your rear end which should be a constant pressure (~1.5 g for a 45 degree AoB). . .If it's a flight simulator you're talking about then just program it to do it for you.