Standard PPL/CPL test teaching is something along the lines of attitude, power, trim. In other words, set the right attitude, let the speed adjust, then adjust power to the cruise RPM, then finally trim out the pitch forces.
However, being realistic, small trim inputs in a long cruise can be an elegant way of making corrections to a more or less trimmed aeroplane - where you've plenty of time to get it right. I'd do this however as small corrections in the cruise, not initial trim conditioning. So the PPL/CPL method is best to initially set conditions.
Most aeroplanes, incidentally, have to be certified as controllable for a return, circuit, and landing - with any single primary flight control failed. So, the pitch trimmer has to be capable of being used to fly the aeroplane as far as a landing if for example an elevator pushrod decides to fail.
G