Just bought a front central grille and was wondering how would i able to fit the grille?

do you mean a linesa grille! If so throw the instructions away fitted mine the otha day

to take out the other grilles, the top one on mine was easy just pull gently from the corners and it clips/pops out. The lower not so easy same clip/pop systems, just found getting a credit card or something simular wedged inbetween the bumper and then using a screw driver to leavy it out worked