Sometimes the calla lilies ship with plastic sleeves around their heads. Carefully remove the plastic sleeves upon arrival.
When they arrive, all the flowers in a bunch might bend in the same direction. Place callas in 10-stem bunches and turn them so that the blooms are all bending out in different directions. Secure them with rubber bands at the bottom, in the middle, and near the top of the stems. This will help your calla lilies will stand tall and strong.
If the small curly tips of the calla lilies turn brown, that is normal. In no way does that compromise the quality or integrity of the flower. Much like a guard petal on a rose, these little tips are the first part of the lily to emerge from the ground and endure a lot as the lily grows and matures. If this condition exists, simply trim the curly tip at an angle right below where it begins to turn brown.