No, you are not allowed to do so, you must not rake the bunker or smooth sand over with your feet, as this is deemed to be improved your stance or testing the ground conditions. You will get a two shot penalty for testing, if you do so.
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No, once you are in a bunker, you may not rake it or ground your club until you are out of that bunker. If you rake the bunker when your ball is still in it, you receive a two shot penalty or loss of the hole in match play.
Mark the ball with a tee, lift the rake, if the ball moves, you must replace it. Then lift the tee and play the shot.