Whether you should trust your personal trainer or not is a question that has no direct answer. To be clear, some deserve your trust and some that don't. If you fall into the hands of some of those meaningless and misleading ones, you'll end up cursing the fitness industry for the rest of your life.
However, the truth is that there are some good personal trainers out there and some bad ones. You can also look for the best personal trainer in Kanata via https://freeformfitness.ca/ottawa/kanata/.
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The first thing your personal trainer should do is research them. You can contact the management of the gym or fitness center and ask them to explain how to hire a trainer.
Ask if the trainer is qualified and certified or not and even ask for a recommendation. Sometimes training a qualified trainer isn't a good idea, but more often than not a certified personal trainer can be experienced outside the fitness industry and shouldn't hurt them.
If the customer is completely satisfied with the personal trainer's performance, he will be referred to the instructor. If you can't find a recommendation for a personal trainer, it's important to stay away from them because they may not know what is recommended for you.
Lastly, always trust and respect your instincts and be wary of coaches pushing you beyond your safe limits as they may not be experts at the job.