Here is a general outline of what I do.

The first step in trimming a plane is for level fight upright. Once this is done, fly plane inverted (when inverted if right wing drops, add weight to left wing or vise-versa to balance the plane from wing panel to wing panel. The plane should fly inverted with little to no down elevator with out any aileron correction trim via what is used to fly the plane upright level flight. After weight is added (to which ever wing tip) you must re-trim for up right level flight and repeat the process again until problem is corrected.

Next step is to see if the engine thrust is set correctly. Pull plane gently into a vertical climb from level flight (not like entering a loop). If the plane flat turns to the left, it will need more right thrust. If it flat turns (yaw) to the right less right thrust is needed. Correct thrust angle if needed.

Correct CG, fly plane at full throttle into the wind. When airspeed is up, chop the throttle to idle. If the plane glide straight and gently looses altitude, CG is correct. If the plane looses altitude immediately after the throttle has been cut. The plane is nose heavy. If the plane gains altitude, the plane is tail heavy. Adjust as necessary.

This is where the rudder/elevator trimming comes into to play providing that the above has been sorted out.

Now... pull plane into a inside loop. If the plane wants to turn in or out while doing this. One of two things are causing this. Either the rudder or elevator halves are not properly trimmed (set) to work with each other.(Just because your pitch gage tells you your elevators halves are aligned side to side one the ground.... does not mean they are in the air.) If the plane wants turn out to the left. Add left rudder trim. If the plane want to turn out to the right, add right trim. Correct as necessary so plane will track straight through out a inside loop. IF the plane does not turn out either way... with very little to no rudder input correction... you are ready for the next step.

Now... perform a outside loop once the above has been corrected. If the plane plane wants to turn out right or left, then the elevator halves are not aligned. In the event of turning out to the left, the left elevator is to low. If it turns out to the right, the right elevator half is to low. Adjust at the clevis by turning in or out. Make one adjustment at a time. Re-trim the plane for level upright flight . Re-trim for true inside loops as described above. Then perform outside loops to see if the adjustment has been to little or to much. After each adjustment, it is important to repeat level flight trimming along with inside loop trimming before performing the outside loop to see if the amount of adjustment has been to little or to much. Once the Plane will fly inside, and outside loops with very little to no rudder correction. Your plane is trimmed for the general basics of maneuvers involved in pattern flying or any other style of flying for that matter.