You can easily move your home folder to the HDD, you could for instance make a symlink on the HDD which will point to the right place on your SSD,but you need to log in as a different user, then move(Copy) your home folder to HDD, delete the original and then make a symlink in that place.
Edit 1 : Although this will work there might be side effects, like backup or encrypting the Home folder.
Edit 2 : If only your Movies, Pictures and Music folders are the big ones then it would be better to make Symlinks only for those folders and not your whole Home folder.