Addressing the last paragraph, grooved weights are dated by the MAS as Early through Late Archaic, so your weights are likely within that entire range, not necessarily at the earliest end of the range.
I do believe, if you truly stick with the hobby, that you're bound to get to the point arrow86 was describing, namely finding yourself saying "God, what in the world was I thinking when I was so certain those rocks were actually artifacts"?
The learning curve varies with the individual. Take my wife for example. She's been surface hunting with me for near 30 years. One day, I thought I'd "teach" her how to do it. I'd show her a particular lithic. She'd walk a field and come back with half a pound of exactly that lithic. I'm like "how the hell did you make it look that easy?!" Another type of lithic. Same result. Within a week, it was obvious the student was a whole lot better then the so-called teacher had ever been.
She got a reputation. Friend saw her out in one of the fields one day, ran over and rubbed her head. "Just hoping some of the luck you have will rub off on me!" Lol. Even I was getting pissed at times, even though all the stuff found was winding up in the same home. Walked into a field once together. Not 10 seconds in, comes "Oh, look what I found!" I say "for God's sake, could you at least give me a fighting chance?! We just got here!" Another time, we're in a huge field with an old timer I greatly admired. Dean of artifact hunters in southern New England. Last of his family of collectors. His dad donated 50,000 relics to what became the Robbins Museum. He himself once drove from NM to Ma, on a motorcycle, in 1945, with a 2 foot stone statue he had found in a canyon strapped to his back! Yeah, I looked up to old Earl, lol.
So, here we are walking over to where Earl is in the field, her with half a dozen, me with zilch. "Here, give me a couple of those points. Well, I can't let Earl know a girl can skunk me this bad!!" Lol. Eventually, I pulled myself up to match her skill. Eventually I grew up and realized I was a lucky guy to have such a skilled hunter as a partner in the hunt.
But, in time, I became damn good at what I do. Including developing the ability to recognize even the most minimal alteration of a rock by a human. You develop an eye for the most subtle clues. It takes time, and eventually that knowledge, understanding, and recognition becomes second nature. Ironically, at that point, it can also become more difficult to explain to a beginner, more so in an online format, why a rock is simply a rock. When the recognition becomes second nature, the recognition also becomes near instantaneous, meaning the experienced eye no longer has to go through a long reasoning process in the mind to deduce that a rock is simply a rock. Thus educating a beginner actually becomes more difficult, not less....