Many people here do the Liver Flush despite having amalgams. I still have some of mine, and have done 9 liver flushes. It isn't neccesary to remove them first IMHO. Of course, it would be great to get them all out, by finances can prevent that from happening.
I personally feel it is better to Liver Flushing BEFORE parasite cleansing. Dead parasites (and dead Candida for that matter) release a lot of toxins that overwhelm the body. After some liver cleansing, your liver will be able to handle eliminate toxins much better.