The fist thing I'm doing is deciding the clothes I'm going to take.
OMG, I didn't know I had sooooo many things! It's horrible. I'm a hoarder! XD
So far I have been able to get rid of two fullbig bags of clothes, but I still have to get rid of more.
I do know I'm taking airplane size toothpaste, shampoo and soap. I do not want to have to go to buy all those things on the first day I'm there after 15+ hours of traveling in airplane, plus internal travel, plus walking, plus jet lag XD
A friend also told me that, if you like big bathtowels, you should take one, that the japanese stores usually only sell small sized ones.
I'm starting to contact real estate companies in case I don't get a dorm, but so far I have not been able to find one that lets you reserve an apartment before being in Japan.
I'm curious as to what vaccines you're talking about.