I didn't try to feel the scratches at first (noob) but after all the time I put in, when I finally had to move on, I honestly couldn't feel anything with my finger or my nail, but they were, every single one of them, still visible.
Since I posted, I thought of all the things that I could be doing wrong and first of those is when you watch an expert do something, they make it look effortless and easy, so my expectations might be suspect. Many things I could have done wrong like the amount of product for correction, maintaining the correct pressure on the PC, keeping the work space small to keep the polish from flaring too soon...
This detailing thing is harder than it looks, but it might be pretty good therapy when its not driving you crazy ... seriously at one point, I was going to get a scratch out, ANY scratch out, even if I HAD TO USE THE POWER OF 10,000 SUNS. At that point, I was called in to eat and I cooled off some.