Writing in first person
I've always liked writing in the first person; the obvious disadvantage is that you can't describe the thoughts and feelings of characters other than your own, but I like to "try on" different personas.
Sometimes this is autobiography and I'm just me telling it like it was, sometimes it's obviously not (for instance, if the first person in the story is female). But often it's a collation of real experiences plus things which I've heard of or read about other people stuck together with the glue of imagination. Should I therefore try to give the reader a clue as to which is which, or leave the reader to guess?