Hi Cali-boy,
Welcome to the forum.
I don’t have anyy experiance with Mystery Boy, but in general, applying to you neck and forearms or wrists are a good option. The back of the hands works well too when you wear long-sleeve shirts, although I sometimes worry I’ll was it off when I wash my hands, so I try not to use this app point unless I have to.
The best way to know what is best for you is to get out there and try it!
Also check out Oasis314’s post on application points here, it is great:
pudleduk