You will get lost in Tokyo, even if you are quite good in finding directions. I had simple directions once from a metro station to a hostel (including which exit to take etc) and I still got lost, luckily there were some Japanese in the neighbourhood who actually understood where I was heading and walked with me to the location. I have been in many cities around the world, including big ones like Moscow, London, Beijing and Los Angeles. Now well London and Los Angeles are easy because everything is in English of course, but Moscow and Beijing are both very logically built up whereas Tokyo is not. Just a mess of many cities melted into one.