I've had great success using Cutler's protocol as my base and then adding my own tweaks on top of it.
I started seeing results immediately, but after 1.5 years of chelating I see what Cutler and so many others meant when they said you are going to be in for a long slog. Just when you start feeling better than ever, suddenly your body will dump out a new load of mercury from deep inside your brain, organs, bone marrow, etc., and the symptoms will come back for you to slowly chelate away again. It's like a two steps forward, one step back process. But I am definitely a new person compared with how sick I was two years ago.
I do know that if metals are your problem, you are wasting your time trying to battle the symptoms (candida, brain fog, shortness of breath, etc.) without battling the cause. If you don't get those metals out, then they will be banging around inside you for a very long time.