There will probably a tutorial with step by step instructions somewhere.
Like this:
http://www.maclife.com/article/howtos/how_install_ssd_unibody_macbook_pro
I think you are correct and you don’t need the cable or caddy. What would be useful is an external 2.5 inch drive enclosure, USB 2 or 3 is fine.
Basically, you’d fit the ssd into that and connect to the mac. Format the drive using disk utility, matching the settings for your current hd.
Then download and use Carbon Copy Cloner to clone your current hd to the external drive. This will copy over everything including the os. You shouldn’t need to change any CCC settings other than setting source as your current hd and destination as the ssd.
Then, the ssd is removed from the external enclosure and replaces the internal drive.
Did this on Wednesday with a Mac Pro, which has the benefit of 4 drive bays so no facing with external enclosures. CCC worked fine and is free for a 30day trial.