Re: Senshusei course
Couple of things to point out.
First is money. You will need some! This is not an expensive course but living in japan for a year is very expensive. You will probably need to get a job while out there.
I have trained with two senshusei students one regularly and one ever now and then. Something both of them said was it was the worst and best thing they have ever done.
One of them (who i hope wont mind me telling this story) once told me how when he got near the dojo he used to throw up in his mouth. This was the bodies reaction to being near the dojo he had no control over it.
From what they say this course pushes you further than you thought physically possible, and this goes on for a whole year.