Ya don't need a 2nd set of hitches but u must have a 2nd independent tie in to the rope. Without it, it's not actually my method as i have never climbed without it.
1. I can take out a hunting knife and slice through BOTH my friction hitches, simulating a catastrophic failure and my Garda hitch will catch me every time, with no doubt. Go to minute 2 and note how i rig it:
2. The Garda with a girth hitch is NOT reliable. Go to minute 2 and see exactly how i tie this bull hitch variant. It's extremely reliable. Figuring out this detail took me significant time, and delayed me significantly cuz i needed to climb on it a LOT before i released it.