42 minutes ago, Christopher Low said:

Can I just clarify what you mean by that? Do you mean that when you need to make adjustments, you do it with the throttle first, then pitch if the throttle adjustments are not sufficient, and then trim if all else fails?

You trim (elevator) at all times when either change your pitch or power, or both . Otherwise you will struggle physically with keeping desired flight profile. 
 

One thing you can check if your airplane trimmed correctly. Let go of your controls and momentarily check if plane  maintains desired attitude/pitch (climb, descent , straight and level flight ). It similar and little bit different in turn . It depends on longitudinal stability (banking) of the airframe and bank angle . Some bank angles require adjustment of the yoke to opposite direction of the turn . Elevator trim is the one we use a lot. Rudder and aileron trim mostly before take off or during emergencies .

Forgot to mention newer Airbuses do trimming for you so it completely different.