Pretty easy to do.
Open up Terminal (Applications>Utilities Folder>Terminal)
Type the following at the prompt (hit your ENTER/RETURN key after each line):
defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder
Now you can see all the hidden files. I suggest you close Terminal while you work with the hidden files so you don’t type anything in Terminal by accident while working.
To hide all hidden files again, in Terminal (see above to open Terminal), type the following:
defaults write com.apple.finder AppleShowAllFiles FALSE
killall Finder
Close Terminal
Done!