I am new to this so cut me some slack if I sound Green, which I know I will. I have been saving metals and want to eventually get cash for them. However, I am having trouble differentiating the different metals apart. Obviously I can identify copper. But after taking apart household items I don't know if I have aluminum, steel or any other ferrous metal or non-ferrous metal. If I take all this stuff to the yard are they going to separate it and weight it? Is it one of those things where I drop it off and leave it to the experts? Or am I expected to know and is it up to me to make sure I don't throw aluminum into the steel pile? Don't want to get ripped off. Should I trust the yard? Please help