Sometimes I don't even remember picking it up. The act of picking it up and bagging it was automatic. I saw enough to trigger the automatic response, but not enough to call it to my attention. So take lots of collecting bags on a collecting trip and make sure that the bags are empty of all material put in them from other days. And one other thing, if you don't have the tools, skill, or patience to extract a stubborn specimen from a tough outcrop leave it for another day or another person.
Every specimen is unique.
Don't let the frustrations of the moment destroy what has survived for millions of years. Avoid collecting in a careless and haphazard manner and you will restrict the confusion that leads to disappointing results. Don't let fascination be overlooked in the desire to be the first, collect the best, or find the most. Fossil collecting is one of the most sublime activities a person can participate in. Just think the next fossil you find may be brand new to science.