In order to do the pin properly, you shouldn't have 4 KCs, 'cause then maybe you can't do it. you need KC+ KC or TR or a village + Goons or Militia + an indefinite number of cantrips + up to one other action, and nothing else.
Also, it IS possible to beat the pin even when in place by having a big enough lead, big enough deck, and the ability to run piles (curses!), as you can always buy a 0 cost.