Big rock rolling down a hill

What’s the best way to make a CG rock roll down a real life hill. I know about the physics and stuff, but one thing that’s hard to do is to make 2 things seem like they’re toughing each other. So am I better off mixing live action with 3d, or do I have to make a 3d hill? Please help, it’s urgent

if your mixing them, I think you would have to model a 3d hill. Either way you gotta make a hill, of some sort.