For me it got to the point of I was surprised to see myself *without* the temporary tatt on. That's pretty much when I knew I was ready to go ahead and have the real one done.

Don't know about the back of the neck thing, tho'. not sure about the pain factor in that location. Although it does have the advantage of not seeing the needle coming at you. Unlike mine where I had a freakin' bird's eye view every time 'chele came at me with it! ROFL!