Gotta relax my shoulders

I was watching David Leadbetter's VCD on Improving Your Short Game. He spoke about 4 main focus for short game - putting, pitching, chipping, bunker shot. He couldn't stressed more on the importance of the short game because 50% of a golf game is the short game.

Starting with putting, I realised my mistake is that I have a stiff shoulders. I'm using too much of the arm movement, rather than the shoulder 'pendulum' action.

Next, pitching - there're about 3 different stance to cater for 3 or more different situations. Situation 1: when you're about a meter away from the apron, a) chipping and running into the pin that's near the apron; b) midway of the green or c) far away from the apron. Situation 2: when your ball is a) stuck in the rough or b) sit nicely on top of the rough. Situation 3: when your ball is behind a bunker (or behind the lake), and you gotta get it over the bunker but not roll too far away from the pin. There's many more, anyway, I gotta practise further to be able to appreciate the different techniques to use.