"if I have kidney problems, is that not going to make things worse?"

It might if you remove your fillings too quickly or chelate too aggressively.

If someone has many mercury fillings, they should have them replaced a quadrant at a time, and wait a month or two between quadrants. I had 25 mercury fillings replaced over a one year period. The removal process raises blood mercury levels, which don't drop below the level they were before the removal until after a month or two.