"Endeavours" by online definition states an 'attempt to achieve a goal'.
And as shown in the 6th Harry Potter book, Slughorn states that the potion:
"However, if brewed correctly, as this has been, you will find that all your endeavours tend to succeed."
Assuming this is true, how would it work in one's odds if the lucky potion was drunken by an unlikely candidate, whose aspiration at the time or specific situation was to defeat Voldemort in a 1 on 1 wand battle
Harry himself can be considered reasonable at battle considering his abilities in Defense Against the Dark Arts classes.
But what if this specific person had scarce desirable combative skills, such as Neville or Ron?
If the power level between two combatants was severely unbalanced would their 'endeavour' to defeat Voldemort face to face succeed, or will it ultimately backfire and seek an alternative such as escaping?