When an instructor refers to open and closed first you must determine if it is the body or the clubface he is talking about, an open clubface has the face aimed to the right while an open stance has your body aimed to the left
Do not make tough bunker shots harder than they already are, when faced with a deep bunker with high lips play your stance and clubface square and let the loft of the sand wedge pop the ball up or just play the ball to a lower part of the bunker lip
Use an open faced 8 iron and blast it out like a normal sand shot