I guess it depends on your size opposed to the props on either side of you.
If you are smaller than them, then Cymro's technique is a very good way of doing it.
In my case, I was the same size in height and weight as my fellow props. And you will need to look at the way they go into the crouching position and use their positioning to benefit you. Remember that your arms are holding on to them, they are your anchors and are supposed to keep you up.
What I used to do was to let the tighthead prop bind on me first. this way, as he brings his left arm around, he basically turns me slightly into position so that my body is slightly facing the loosehead side (where the ball will be thrown in). the Loosehead will then bind but won't have such a good grip as the tighthead has, as the loosehead's arm will be over the tighthead's arm onto my waist.
Now when the pack has binded and your locks are in position behind your props, you can position yourself, as they will be able to hold you up. If you are going to hook with your right leg, then put it in front. The ref usually makes a mark where the centre of the scrum is. You as the attacking team which will have the throw in to scrum, are allowed to place your foot on that mark. Then use your left foot as your own anchor to set yourself. as you bind, try to drop your right shoulder, slightly, to give you an angle towards the loosehead's side to actually see the ball coming in. then just try to get your foot closest to the ball ahead of your opposing hooker. you don't have to hook at all, the ball will go backwards off your foot because of the angle it connects between your foot and the ball.
As for when the opposing team is throwing in, just swap the props binding around. Another handy trick, is to kick the ball instead of trying to hook it. the ball is bound to go anyways to the back of their scrum, by kicking the ball before the opposing hooker hooks it, will usually make it bump off one of the knees of the locks and bounce back to your side...
