1. Practice left handed with a real left handed club. Get to where you can make good contact. Use a left handed grip, even invest in a right-hand glove if you plan on practicing this way for a while. Most driving ranges have loaners, so start there. I got to where I wanted to relearn this way completly and now have an entire set!
2. While still at the range, and you have some good shots under you and are warmed up, take out the right handed PW. I use a PW because it has the widest face, and is short and easier to control.
3. Flip the toe of the club down (rotating it clockwise 90 degrees) and now you see that the face is generally square to the target from the left side. The loft of the face is now dictated by the angle the toe of face is as it points down.
4. Take a few practice swings and try to sweep the ground without grounding it. The problem if you ground it, is the toe will dig and keep digging...no real bounce with the club this way...so percise sweeping is necessary.
5. Place a ball in the WAY back of your stance (now off your left foot). You need to do this because the normal face angle of the PW is such that you have to square the face correctly with it in the back. And this is just fine, because you get to hit the ball first, and a ball in the back is easier anyway. If you want to get better at this, using a 7i will allow you to put the ball further up, but you have the shaft longer and the face is narrower...but play around with different
clubs what works better for you.
6. Swing 1/2 power to start. The first couple will feel really bad in the hands, because the club is not designed to be hit this way, so expect a lot of shatter. The better you strike the ball first and not bottom out, and the more you are able to feel a normal left-handed smooth transitional swing, the better the ball will go.
You can easily make it go 100 yards...most will be very low, but occasionally you can get it just right and get good loft on it.
The real use of this shot is from a trouble lie. So not only do you have the left-handed issue to deal with, so make sure you can even hit it that way under normal conditions, but you are usually against a tree, bush or next to a bunker that would make it impossible to play a normal right handed shot.
My first real attempts at this were wiffs, and were always, "what the heck made you think you could do this?!?!". So this is why I make myself learn lefthanded, so I could make a good swing at it to better my chances.
It's always fun going to the range, with a lefty club in the bag, starting out with it, makeing good contact and guys next to you seeing you hit it thinking, "ok, he's prabably a 18 hdcp...not too bad". Then taking out a right handed club, flipping it over, and shanking it, topping it, then making a frew good shots and the guy not noticing you have this club this way and he's now thinking, "yikes, maybe a 32 hdcp?!". Then, switching sides and finishing out the practice, and now the guy is completly freaked out and you end up explaining what you were doing. Always fun.