I can only comment on Pompeii, we were there last year for our
honeymoon and travelled by ourselves from Naples to Pompeii on the
local circum. train it was easy to do. When you get there it is a
massive site, a brief guide to Pompeii that you get when you enter is
sufficient. Take plenty of water and be prepared to spend several
hours there. We actaully found Hercuulaneum better preserved and it
was easier to comprehend what had actually happened there. Enjoy