If you are a beginner in your practice, I wouldn't advise doing a Runic working or any kind of thing like that, as you are unlikely to have the necessary skills to raise and program enough energy for it to be effective.
Make sure to properly clean your aura and chakras before the interview. This meditation should be easy to find, and HPS Maxine has spoken before about how a clean aura can make one more charismatic.
If you have time to do some deeper cleansing during a Saturday before the interview, that could help.
HPHC has a sermon about this:
Witches' Sabbath
Meditating on the SATANAMA mantra can help balance your soul and aid in many things, like keeping you comfortable during your interview and making sure things are going smoothly.
I would also recommend the basic Hatha Yoga session done before the interview, if you don't already do it regularly, in order to have higher energy.