I agree with biker_km. Original paint is a good base and does not have to be removed.
wet sand it to get out any scratches and chips and primer it. Look for any flaws and sand them out and primer again.
continue until your primer coat does not expose any flaws and then paint.
if you must strip all the paint off, home depot has a product called citrisstrip. It is an thick orange gel that you can paint on with a disposable brush. it is very good at stripping paint without drips or getting toxic stuff running all over the place or sprayed into the air you breath.