If you want to effectively train for backcountry hunting in mountainous terrain, you need to train specifically for the demands of that pursuit. You are not a runner training for a marathon. You are not a powerlifter training to raise your lift total. You are not a Crossfitter training for a score. You are not a bodybuilder training to sculpt an aesthetic physique.
You are a hunter, and you should be training to hunt more effectively.
Confidence is something that is developed over time, by experience. Attempting new things often feels difficult and awkward. But with some experience, these new pursuits become comfortable, and we become confident. You don’t have to think about walking any more, you just do it. Having a conversation with someone is commonplace, and you rarely need to think about finding the right word to convey your thoughts and then strategically try to pronounce that word correctly. Talking just happens. It wasn’t always that way though.
It takes time to develop competence and confidence in all skills, including hunting.