The above is Bob on, but If your a complete novice as stated, one would assume you’ll be being guided for said buck, and I would hope your guide would know what to do, but worth having the conversation with them before hand as it’s very easy for a knife to get stuck in the front of the throat to bleed before you’ve had chance to say stop post shot. Autopilot often kicks in.
Also, don’t go out with a view to finding a wall hanger, there’s nothing wrong with wanting one, but go and enjoy the stalk you might well find your “buck” is a young pricket which would still be a great memory to keep but might not be worthy of the investment in taxidermy, a simple skull mount to preserve the memory would probably be more apt. Keep an open mind and enjoy above all else, wall hangers come with time.
(You may of course be going specifically to target a large buck in which case ignore the above, but still enjoy the moment rather than focusing on what you want on the wall!)