Workers Comp lawyer fee's?

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Can someone explain if these fee's sound fair, I am looking into getting a workers comp lawyer to represent me. Also if you can explain these numbers a little more in normal person talk that would be good also, I never been on workers comp before so all this is new to me. This is basically what the Fee retainer statement says, i'll write it all out.

Attorneys fee's normally range from 12% to 15% of the benefits awarded. If penalties, interest or sanctions against the insurance carrier or the employer are pursued, or if any award other then the temporary disability, permanent disability or medical treatment or the value thereof are pursued, then, on those other matters, the attorney fee is 33% of the amount obtained by the way of settlement or award. The actual amount of your attorneys fee will depend on the time expended as well as the complexity of your case. The fee must be approved by the workers compensation appeals board. The attorney reserves the right to send you for a comprehensive medical examination. This cost may be assesed to you by the court. If your attorney represents you before the rehabilitation unit, there will be a fee in conjuction with the representation. That alot I know if there is someway you know something about this an can clear any of it up to me please feel free to leave an answer, thanks...