here is my bunker techique which as a beginner gets me out of bunker 9/10 and i find is getting easier and easier.
there are three parts – initial alingmnet , the adjusted alignment , swing
Initial stance
1. take a wide stance for stability with the ball opposite (in line with the left heel ) and the feet at right angles to the target line as if for a normal shot — the line through the toes is parallel to the target line
2. -SHORTEN THE GRIP and the club face is square to the ball and aimed at the target as if for a normal hiT
3 now , without moving feet , rotate the club face open in the hands and regrip in the rotated position( maintain this grip position AND THE SHORTENED GRIP ).This makes it easier for the club to get through the sand .
if you were now to swing along the target line the ball would go right because the club face is open
adjusted stance
4. Now open the stance by moving the left foot behind its initial position ( in the direction of the heel ) turning the foot slightly to the left to allow for clearing the swing untill as the stance is opened the club face comes back square to the original target line . this means the more you open the club face the more you open the stance.
5. in the open stance position wiggle the feet untill they sink into the sand. AT LEAST I INCH – THIS DROPS THE BODY HEIGHT RELATIVE TO THE BALL SO THAT THE CLUB FACE GOES AUTOMATICALLY UNDER THE SAND
6.fLEX THE LEFT LEG FOR STABILITY AND SHORTENED GRIP, lean the weight forward onto front leg which gives stability and power behind the swing

7 make your normal swing along the body alingment line – ( the line parrelel to the toe line not along the target line ).
the club face will skim easily under the sand behind the ball because the feet are below the ball and the club face is open and the weight is forward
the ball should go to the left of the target line in the direction of the swing but goes straight ahead ( along target line ) because the club face is open

adjustments – open club face more for deeper bunkers
– ball on up slope – open face less because the club us already swinging up
– steepen the swing plane and hit harder into into sand where ball is more burried in sand
– is much safer to hit up the slope not down a slope
– the deeper the feet in the sand the easier to hit the sand and not the ball.
the further the distance required for the hit the longer the back swing.

follow through imagining your hitting the sand behind the ball ( not the ball) along the the swing plane onto the green .

if you have a better description would love to hear it – iain edwards