Why bother asking; you've got the procedure down cold!
No need to reformat the HDD (which would wipe the data). The only trick is, because both drives are bootable, to ensure that you boot off the SSD. Heck, you've got a spare boot drive in case the SSD fails. What I do is to ensure that the SSD is on the lowest-numbered SATA port. That way, if the BIOS reshuffles boot priority, it takes that one first.
One useful thing is to repoint My Documents, My Music, and My Everything Else to the HDD. If you repoint them to the existing directories, they will have all your old documents.
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That said, there will be one problem if you do it that way, and that is the ownership of files and directories. If your login is "sam", the files will show in your old install as being owned by "sam". But it is really owned by "S-1-5-21-346691086-2920044697-4026809194-4451", and in your new installation that string probably does not correspond to a username. So you would have to change ownership. I've had this issue a couple of times.
If, on the other hand, you backup all your data to an external drive, verify the backup, reformat the drive, and then move your folders and restore the data, this issue will be avoided.