SuperSport Ron

Just had a new luk clutch put in along with with a fly wheel and a slave cylinder and also the a master clutch and I'm still having shifting problems. It's hard as hell for me to get my camero in reverse and sometimes when I pull up to a light and pop my car in neutral and try to to put it back in if first it won't go in, I got to really force it nothing ever really grinds though....can anyone tell me what's wrong with my car!?!?! Please and thank you