'~' is your home. So ~/.themes is like /your home/.themes
For the hidden files in Nautilus you should have in a menu an option 'see the hidden files'. Click on it et voilÃ
K.I.S.S. ===> "Keep It Simple, Stupid"
"Simplicity is the ultimate sophistication." (Leonardo da Vinci)
"Everything should be made as simple as possible, but no simpler." (Albert Einstein)