It's a really tough gig this, but my thoughts are as follows:
1. Liverpool will be busting a gut to get at least 1 goal, on the pretty strong assumption that they are through if they do that.
2. The only way I can see us stopping them scoring is if we do not allow any opportunities for them to hit us on the counter. We'd have to play much more cautiously and with more players back than we normally do. And if we do that, we very likely won't score 3 goals.
So in my view, I think our best approach is to accept that Liverpool will score 1 or 2 and we just need to plan to score 5 or 6. Their defence is not all that - their keeper especially is vulnerable, so we need to shoot on sight (on target would be nice) and make them make mistakes. Win as many corners as we possibly can. Free kicks in dangerous areas etc. And above all, when our chances come, for FFS we must take them. We could have been literally 8-0 up at half time agains the scum and we were 2-0 FFS.