That's a dicey one, I mean what if you never get the chance to get down the line? i.e. miss the first 2 or so penalties or your best man never gets a chance because of what others did before him?
Personally I think a team's best bet is to have your best 2 penalty takers be no1 and no5 and if you've got a lot of weak penalty takers in the team, like our lot, then you bring it forward and your best 2 should be no 1 and no 3, or something like that to inspire some confidence in the lesser lot.
Didn't watch the game but I'd never bet on Liverpool losing a penalty shootout, it really surprised me especially since they were at home.