I'm not going to give you any tips on shooting,or stalking. Thats your guides job..
But the best advice I can give you, is prepare all that you are taking the night before..Decide what you are wearing, that is suitabe for the conditions. What you must do is be at ease in everything you are wearing. Such that you are not thinking about, are my shoes comfitable, am I about to get wet, am I cold?? etc, etc.
Your mind should be focused on taking instruction from your experienced guide with out minor distractions from ill fitting boots, cold, draughty clothing, cold ears etc. I dress like