We absolutely need to win one of the first two games. From my recollection, only one team in history has swept its three games at home in the 2-3-2 format. That means we need, at the very least, a split in LA.
If we come back from LA down 0-2, it's going to be very, very difficult to win this series. Not impossible (the Heat did it against Dallas, with some officiating help), but extremely difficult.