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Here is the very short answer, but has been effective over the past decade and a half.
Start with Warm Soapy Water (Should probably get the majority depending on the density of the spill) and if that is not enough fire power use Denatured Alcohol. Always try to avoid chemicals if possible as different carpet reacts differently to chemicals depending on the actual material and dye they use.
The short answer on this is - $900-$1,250.00 - Inclusive (Range in price is due to the amount of prep work and current condition)
You will want your vendor to do the following:
**** You will also want a life time warranty on quality and repairs (Excluding Wear and Tear)