Like what others are saying, you can always opt to clone the hard drive. But then again, para mas sigurado and to avoid encountering issues (relating to the system), mas maganda kung maginstall nalang ng fresh copy of Windows and then transfer yung files.
You can also take advantage of this time to do housekeeping sa mga files mo. For sure naman you wouldn't transfer all your files from Hard drive to SSD. Lalo na kung maliit lang yung capacity ng SSD.