The easiest way is to use an external FC dock.
That excluded
this seagate FAQ has some good methods for a build out.
In all honesty if you're not set up for FC to begin with and don't intend to make a habit of dealing with them: Take them apart. Wipe the big hard drive magnet over the bare platters a few times to wipe the data. Aside from the heads and aluminium and stainless shell boardsort will buy everything inside. Keep the awesome powerful magnet for your bench.
Fc is nothing more than optical scsi.