#1
im having trouble in the main riff of the song going from the c chord to the g chord i cant seem to get th g down fast enough...im i doing something wrong?
#2
advise from me is, just go over it repeatedly untill you build up speed, and maybe try diferent ways of rolling off a chord into another chord + hand positioning is a BIIIIG key! ^^

Enjoy!
#3
btw, it is a bit hard for another person to tell you without seeing how you do it... but yea, the above is my guess m8