Japanese etiquette - visiting a home??
Most entertaining takes place outside the home, so if you are invited to a Japanese friends home, here are some pointers:
When entering the house, take off your shoes in the lobby (genkan), and put on the slippers provided. Before entering any room laid with tatami mats, leave behind the slippers and carry on in your socks/or bare feet. So, before you go, put on clean socks!!. Men usually sit cross-legged and women can too, if they're wearing trousers/jeans. If not, fold your legs under you. Be aware, if you need to use the loo, you need to take off your slippers and put on the special 'wc slippers' before entering, then change them back after leaving the loo. Etiquette is hugely important in Japan, and your efforts to fit in will be much appreciated by your host!