Thank you so much everyone, for the advice and insights you shared, now I have a much better sense about OEI controlling techniques and I can't wait to practice the methods you suggested, incredible insights.
By the way, the aircraft I am learning to fly is a Cessna 310R with GFC600 Autopilot, which have auto-trim and rudder-bias, I want to be able to handle the aircraft without using those automations. Thanks again to everyone, your tips were like golds for this newbie pilot.