I have a Skype interview tomorrow after a phone interview. I am very nervous as I don't know how this will go. Its a fully funded Ph.D. and after the phone interview my potential supervisor was impressed and he quickly fixed a follow on interview via Skype with his Co-PI. Please, I just need some advice guys.

Congrats on giving a good interview. Have you had your follow up interview yet? The advice may be too late, but just do the same thing as you did in the first one. :)

Good luck!