I'd stick with a specialist when dealing with OIC. Certainly not those on TV (I think Ms. Roni has been disbarred or turned in her card and is in the deepest of the deep hot water for her actions.), but someone with experience and training in the process.
Attorneys are useful when there is tax court in the future, if the men in suits and ties come to the door rather than just in ties, or in preplannig where there will be some manipulation of independent entities for tax and business purposes.
For $16K? I don't know the underlying issues or if an attorney is needed. Just getting a representative does not mean the tax burden will be reduced. There must be VALID reasons.