When I began searching for a job back in '04, I was advised by experts that a clean-shaven face was a must for the interview. A bearded face was a job seeker's death sentence.
Now me, I follow the opinion that you leave the beard alone and just let it grow. Most people don't follow that opinion, and I'm cool with that – I'm just happy when I see something resembling a 5 o'clock shadow on a brother's face.
I point out my beard size for a simple reason – generally speaking, the longer the beard, the more difficult it is for one to find a job. The advice which follows worked for me, and inshā'Allāh, if you follow an opinion which prohibits shaving or trimming, this advice will benefit you.
When I prepared myself for the interview, I did a few things: