Check out Andy Cutler's book Amalgam Illness. His protocol is to take the main chelators (DMSA, DMPS, and ALA- >Alpha lipoic acid) according to their half lives and keep a (very) low dose of the medicine constantly in the blood. If there are too many symptoms you lower the dose to a comfortable level.
I'm taking 10 mg of ALA every 3 hours right now & 4 at night, every round (3-5 days or so) you notice slight improvements. There are no fast ways to remove metals of the body but this is the most effective and safest (I have heard of no bad reports of someone following the protocol) way to do it.