We've all had the problem of the ball below the feet. This is a problem shot for many golfers as there is an innate tendency to catch the ball a little thin, either skulling or topping the ball. Let's get ourselves out of the mess with a couple quick adjustments to our stance.
First we're standing facing down hill so when we bow to the ball we're going to have a tendency to want to fall toward the ball. To fix this we're going to 'sit' a little in to the hill by flexing our knees a little.
Next we want to increase our stability so we'll widen our stance a little more than usual. A little more than shoulder width apart should be good. We want to make sure that we keep the ball in our normal set up position to maintain solid contact with the ball.
Finally we need to understand that because of the hill angle, the ball is going to have left to right movement after striking it. Depending on the lie you can adjust for this by aiming 5-10 yards to the left of your target.
And that's it, make sure you set up as we've discussed and hit your normal shot.