Yes, don't worry, if your mousse is CG friendly it will wash out without any problem.
If the humidity in your area is high you might want to avoid glycerin, pathenol, sorbitol and honey especially in your leave in / styling products. Really reduced my frizz.
Just go for it!
Your hair won't fall off your head or anything, in fact a normal shampoo method is FAR more damaging than CG. Just give it a try, see if it works out for you for a couple of weeks (it most likely will, it does for most people. Oh and remember for the first 2 to 6 weeks your hair might look bad and feel greasy (right now your hair is used to the fact that it constantly gets stripped dry by shampoo), but after that your hair will be totally beautiful
). If you're still not entirely convinced after 6 weeks, adjust your routine a bit, expiriment