I’ve never hunted out west, but took my first trip to CO from NY recently and would 100% suggest this. Even if you are in good shape and workout regularly (I do), the altitude will most likely kick your ass until you get used to it. Hiking and even possibly just regular activities could be significantly tougher depending on how sensitive you are to the altitude coming out from sea level.I went for the first time last year. Once you get your gear squared away,the most important things are be in shape and have the best boots you can afford. First day the altitude will kick your ass,I recommend a slow,warm up day.