What he said. If the heli always drifts a certain way, then trim it. If it is more than a few clicks, then take a look at the control throws and make the needed adjustments to keep everything centered. A good flying heli should be able to hold position with the sticks neutral,... if it doesn't do that, you have to continually fight it, and you are just making more work for yourself.

You will still need to compensate manually for things like fast climbouts, but I am assuming you are talking about basic hovering for the sake of this discussion.