how to use trim tabs? tilting motor on plane

[basswacker]

How do you use your trim tabs/tilting motor when on plane. When I put the motor in gear I have it all the way down one the rpms are up to where I want them I raise the motor but how much? And do I just use the trim tabs to balance side to side? My dad says the boat plows too much when cruising but he has no clue about the trim tabs/trim/tilt.