Hi, anthony. I agree that you will have studs in the wall and a good stud finder will show you where they are. However, I can also tell you an easier way to apply crown molding. Take a sample of your crown and set it in something square, like your miter saw, with the top of the crown on the base and the side on the fence. Now take an angle gauge and set it for the angle that is formed between the base and the crown. Also measure the dimension from the fence to the top of the molding. Set your tablesaw to the angle formed. Set the fence to bisect a 2x4 while it is setting on the 1-1/2" side and check that the widest dimension is mo wider than what you measured above. Now rip enought 2x4s to go around the room. Nail the ripped 2x4's to the wall at the ceiling and nail into the studs. You don't have to be real neat with this as it is just a nailer and will not be seen.
Now you can go ahead and cut and install the crown in the usual method except that you don't have to worry about where the nails go. You can nail the crown up anywhere since the nails will go into the 2x4 nailer that is nailed to the studs. This is harder to explain than it is to do and since the 2x4's are relatively cheap, it does not add much cost to the job. At the same time, it makes installation a lot easier, particularly if you are doing it without a good helper.