Nishant, you playing a strat-type guitar or les paul type? it is easier with the strats cos the bridge saddles are flat and easy to rest your palm on. abit harder with les paul bridge.
when you just starting out, try muting the E-A-D strings first cos it's easier to get that percussive sound. Then try muting all the strings together. Then try plucking out a riff while muting the strings. have fun!