I have tried partial. I was unsuccessful. Advice: if you aren't passing out in 10-15 seconds, it's in the wrong place. But, also, be wary of even testing partial. I thank my lucky stars I didn't get brain damage. The first two weeks I was convinced I was brain damaged. Getting it in the wrong place feels like your head is freezing off, but your able to breathe. It's an unmistakable, unforgettable, feeling. You'll know when you're doing it right.
Wish you the best and that you don't have to catch the bus X