I strongly suggest you have a solid TSFS 360 before learning the 5. You'll learn to spot your landing properly and get a good feel for the handle pass. After learning and becoming consistent on the TSFS 360, then just pull a little harder to initiate the spin, spot your landing, it helps to pass the handle in front of you again to what will now be your front hand, and get the board beneath you.
It sounds cliche, but it's really just like taking 2 tricks you should have solid (TSFS 360 and TSFS 180) and putting them together. Good luck!