iv just done the migration with 128GB SSD and 500GB normal drive and its pretty darn simple, all you do is copy you user profile over to your non SSD drive, then just go into your system preferences > Users & Groups > Click the padlock and authenticate > right click on your profile > advanced options > then change your Home directory to the new location.
You will need to do a restart for it to take effect but worked like a charm for me... Just make sure the non SSD drive is NOT Encrypted, i found this out the hard way and had to do a reinstall! just as a backup measure, create a second admin user account incase anything goes wrong!
This will put everything on your new drive and keep the OS on the SSD drive!
Enjoy!
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