As a fellow newbie to the forum, welcome. Read the epic .223 for deer/elk thread. It will give you another option for what to look at. I’ve tried the Tikka .223/77gr TMK solution. It is fantastic.
First of all, think thru the whole sequence many times before you ever step in the woods. All the way thru, from first sighting to pulling out the knife. Practice that hundreds of times.
In the woods: control your breathing, check your aim on the engine compartment, and smoothly release...