you can do i woudnt recommend it but not to rockwool trans plant straight into net pots with grow rocks. as far as a proper way I did it like this before get you a good size bucket or something fill with water and have a spray bottle handy. start bye that plant out current pot dip and stir in water (gently) you will start to see soil coming off spray and dip spray and dip until soil is gone
it will take a while but it will work