[Unanswered]  yahoo auctions

Just a question, I'm planning a trip to japan next year, is it straight forward enough for me to set up a yahoo account and pay with my credit card? 
does it have to be a special credit card or just any in general. 
also anyone ever opened a japanese account whilst visiting, how easy is it to do?
It is probably rather easy, but will you really have:
1) a unique address while in Japan;
2) access to its mailbox;
3) a proof of residence? Because if the package is too large for the mailbox (most would be), then you would need to go to the closest post office and they will probably ask for an ID issued in Japan showing that address.

I suppose that you could try using a tenso address, but then I honestly do not know if any of this is worthwhile at all hah.