can I do a liver cleanse first or is that dangerous?

I was told a Colon Cleanse right away may dehydrate me due to my symptoms (acid/mucous/light tan stool and not going enough as I should. stools about as girthy as my index finger. no good))
is this true? should I do liver right away?
if not, how long must I do a Colon Cleanse before I can safely liver cleanse? I dont want to wait a whole month ...any advice would be great
thanks!