^^^little correction. the technique u r telling is absoutely perfect. no question abt it. however, i think jayanth has already said this but i do like to repeat. for the 'F' chord...put the thumb on a bit left sid away from u and not exactly but near to the back of the index finger which helps to put more pressure on the strings by index finger so dat the strings dont mute often. the technique u have said is absoutely correct but for F chord i think this technique will help you a lot.