I don't have any recommendations (so feel free to disregard the whole post!) but want to reassure you that getting around in Japan is surprisingly easy. Between the inherent kindness/ helpfulness of the people, the excellent signage, and good old google, we found it incredibly easy to navigate without hiring help. I was a little nervous-- it was my first time in an Asian country-- but everything was smooth and clear and weirdly intuitive. We had a wonderful time.
Enjoy!