Rudy still uses his whiskers in much the same way as wild dogs have been using them since the beginning of the dog species. But since becoming domesticated, their usefulness has slowly faded. While trimming them may feel to Rudy like you have just plugged his ears and put a blinder on him, it will only last until they grow back out. It can be very difficult to trim a dog's face without trimming his whiskers, but it's not impossible.
Your dog's whiskers do grow back very quickly and it really won't bother him overly much if you do accidentally trim them. But, by taking your time and going slowly, you can successfully trim his face without cutting his whiskers which can maintain the look that you want him to have before and after his groom. Don't stress about any accidental cutting of the whiskers, as Rudy will get them back in no time.