The more you play, the better you will get. It is not easy to start hitting six shots from the start. Even after plenty of practice you will find it tough to play the all the shots. The best way is to play six shots down on the long on and long off boundary using DOWN + SHIFT + S. Players who have good calibre like Sachin Tendulkar, Virender Sehwag, etc. will be find it difficult to hit six shots. If you try with other players you may end up with a mis-timed shot and give a catch. If bowled onto the stumps, for beginners play it down the legside using S + RIGHT.
=When the ball is pitched just in front of your leg outside offstump or towards center stump, sweep it through the legside by a powershot. Most of the time the result will be a six.