A few months after finding the dentist who has since removed all of my mercury fillings, I hooked up with a homeopath for the purpose of getting a little better handle on the complex issues surrounding chelation. Homeopath had me perform a heavy-metals-challenge test. This involved taking some pills containing iodine, then capturing urine output during the following 24 hours, with the urine sent off to a lab for analysis.
There are numerous test methods out there.
If you have ever had mercury fillings in your mouth, it's a pretty safe assumption that you are suffering from some amount of heavy-metal poisoning. Likewise if you have ever been a smoker of cigarettes, especially commercial brands as these will fill you up with various harmful chemcials to include other heavy metals such as cadmium (I think, may be wrong).
The task of chelation seems to be near equivalent to writing a computer program; there is no single way to do it, there are numerous paths one can follow. The results one gets will depend in large part on how well the program is written and which paths are taken AND/OR avoided. Same thing goes with applying a chelation program to one's body. There are many variables, it's not an exact science, and some of the issues and practices to be found are matters of debate. For these reasons, it is generally taken as sound advice to first begin the process of learning/educating & informing yourself of at least some of the main issues involved before actually deciding to begin a particluar chelation method. You are in good stead in this respect, CureZone is loaded with a lot of related information and links to other information resources. Good luck!