I take the usual process! And if I have gone through everything (including left handed bowlers/line of run in, etc) and then the obvious height, turn, distance hit from wicket, etc, etc! and if I can't find any doubt, then the finger goes up! Their team, my team, who cares! If it's out then I would hate to cheat! After all, there is no point in 'winning' a match when you know that you should have given out to a couple of your players! Then it becomes a farse!