PeachLova

RP it well and be smart both in rp and ooc, make sure you have several people with you if it's a high profile character like a noble, and possibly a distraction like a fight with the guards or something, i'd probably go straight to pvp if the person you're trying to kidnap fights back cause rp combat when you're the bad guy usually ends up with the fight going on for 20 mins and a load of people jumping in to kill you.

Do you mean like OOC stuff? Because I don't think there assassinations count as anything different from a standard killing of a player. Even players who play as nation leaders are still not forced to permanently kill their character. 

True, there's nothing you can do to make someone kill their char off but if the rp was fun then it might convince them to kill their char's off if it was a noble or something along those lines.