All conventionally configured aircraft will demonstrate a pitch change and deviation from the trim speed with any change in power. With one exception of a high pylon mounted engine the airplane will pitch up with increased power and pitch down with a power reduction. In other words the trim speed changes. You can trim the airplane perfectly for any given power setting but any later power change and it will be out of trim.

In your early flights the instructor/mentor will most likely do the trimming for you and/or talk you through some trim changes. At some point you must learn to do in flight trimming and its not hard but a surprising number never learn this skill.

I am not sure what mode you will be flying but I only teach mode 11, having always flown mode 1 from my first reed sets until about 12 years ago I decided to make the change. Flying mode 11 I have the students set at home in front of the TV with the tx in hand and practice finding the pitch and roll trims (mode 11 right stick) with their left thumb with out ever looking. In this way they never let go of the pitch and roll stick (which is likely they are holding pressure on since we are trying to trim anyway) and never take their eye off the airplane.

John