Alas, you cannot change other people, it's absolutely impossible !
You can probably manipulate him (it's quite easy), but there will be some unpredictable side-effects (some may be dangerous for you !), so I won't recommend it.
In fact, it's almost impossible to change ourselves, and the change's process is quite mysterious, since it doesn't depend on will power, contrary on what most people believe.
In fact, his problem is that he wants to NOT change, and not changing is already taking all his efforts.
He's probably trying to keep control of his life, even though it's just an illusion, since nobody can control his life. I may die tomorrow, who knows ?
Since you probably want an action, here are a few suggestions:
1) DO NOT HELP HIM, let him suffer from his own incompetence. When he'll reach the bottom (which may happen in a long time), he'll be forced to stop resisting.
That's what most people have to suffer in order to grow.
2) talk to him, and ask him what he fears. Our fears are mostly mental images, without real basis.
Expressing fears by talking or writing helps people realize that. I saw other techniques like EMDR, but you are not a therapist !
3) ask him what he will do once he'll lose his job. People rarely realize that their job doesn't need them.
I call this technique "electroshock", it'll force him to think about his job.
4) change yourself ! Since you cannot change others' perceptions, just change yours.
Realize that you want control in your life, and just abandon this control.
You'll notice that fear appears, but it's not real.
Once you accepted that this fear is not real, you'll notice that most of your efforts become useless.
In fact, change is effortless, and only resistance requires effort.
Once you'll reduce your efforts, you'll notice how much efforts people put in their lives, just to match reality with their dreams.
When you start changing effortlessly, you'll notice that you understand other people's miseries better, then people will try to mimick your natural way of being.
Tell them to be themselves, and you'll notice that they'll start changing, but very slowly.
5) read a good book about NLP, which is full of manipulation's techniques.
I personally don't recommend that, since it will give you a false sense of control, but it works sometimes.
Finally, I'll you ask a few questions:
1) why do you want to help him ? Is this because you are compassionate or do you want to have a better image of yourself ? I'm such a good guy, I can help people at my work.
2) you cannot change other people, why do you believe that you'll be able to achieve something ? If you have the expectation of changing him, you'll be disappointed, since he's probably comfortable in his current life.
3) why can't you accept him as he is ? If you work with him, just show him how to work efficiently. If you don't work with him, why do you care ?