I guess one question I have is, how do you get the cat used to the NOISE of the shaver?
OOH! OOOOH! *waves arms up and down* I can answer that! I wanted Nito to stop being afraid of the vacuum, because he would get soooo stressed whenever I would clean (hiding for hours on end after I was done). So I started with the hand held dirt devil. He knows the "touch" command, so I signaled to the dirt devil (which was off) and had him touch it, and rewarded him heavily several times. Then I picked it up and moved it towards him, and then rewarded him. After he was fine with that, I turned it on for a second and then quickly off, and rewarded. He soon got the hang of that, so I turned it on longer. After he was sitting calmly while it was one, I began to inch it towards him. In the end, I had him touching the dirt devil while it was on. I repeated this process with the big vacuum. From that day, he no longer runs and hides from any vacuum. He simply gets up high on his cat tree, or somewhere else, to watch.
You can apply a similar technique with the clippers. Get them out and present the clippers, and reward. If the cat makes a move to sniff and investigate the clippers, heavily reward. Run the clippers while off gently through the cat's fur as if you were shaving them. Reward. Turn it on for just a moment, and if the cat is still there and hasn't bolted, reward. Gradually increase the amount of time the clippers are on, rewarding and praising the entire time. This might take several days. But over time, hopefully kitty will become desensitized to it!
It only took Nito 3 days of practice to lose his fear of loud noises (esp. vacuums). But I credit this to the fact that he already knew touch, and so the vacuum became an object of training, instead of a monster. But remember- patience will get you far in life especially when it comes to cats. Good luck!