Okay, here's what I'd do with a timebelt. I'd go forward about two hundred years or so and take a tourist trip to the moon. I'd rent a spacesuit and visit Tranquility Base. Then I'd pop back to July 20, 1969, so I could be the first person to shake Neil Armstrong's hand when he came down from the lander....
Anytime someone tells me I've written something offensive, I thank them. You don't discover truth by being nice. You discover truth by being ruthless in your pursuit of it. And the ruthless pursuit of truth is often offensive.
The following authors have used first person without ill-effects: Robert A. Heinlein, Theodore Sturgeon, Arthur C. Clarke, Stephen King, Kurt Vonnegut, J.D. Salinger, Herman Melville, Mary Wollstonecraft Shelley, Charles Dickens, Mark Twain, and (correct me if I'm wrong) Dante Alighieri. The prejudice against first person is stupid. The writer should write his story in the voice that is most appropriate to the material. All other considerations are irrelevant.
My problem is I move my lips when I type. I'm not kidding. I speak the words aloud as I type them. If it's clumsy to say, it's clumsy to read. If I can hear the rhythm of the words as I speak them, the reader will feel that same rhythm when he reads; the result is prose that flows. (There was one author, I won't say his name, but I couldn't read his books; his stories were fascinating, but his sentences were so klunky they hurt.)
I have worked as a writer and an editor and a teacher of communication skills, so I am particularly sensitive to misspellings, misuse of grammar, and flagrant illiteracy. If you caught me in one of those errors, I would be more embarrassed than if you caught me with a white house intern.
You can't really teach writing, but you can teach techniques. The best writing instructors are a little bit like nursemaids and a little bit like Socratic masters. And a little bit like drill sergeants working with live ammunition.
What's the difference between writing and being a writer? Well, writing involves sitting and typing and sitting and typing and sitting and typing and sitting and typing. Being a writer means going to conventions and sitting on panels and talking about how hard it is to sit and type.