Fleas

How do you get rid of fleas?? I've never in my life had to deal with a flea infestation... These poor kittens, came with fleas... We have sprayed furniture, rugs ect. and bathed kitties, I put frontline on them the day they were 8 weeks old.... just over 2 weeks later, we had fleas again, the vet said we had an infestation... so we again put frontline on all cats ( $50 worth twice in 2 weeks) and then we fogged the house.... I have since seen 2 fleas... Do I need to call an exterminator?? UGH!! Anybody who knows me well, knows I can't stand bugs... dirt.. germs... ICK!!!