Buyer & seller agree on terms, do we need to list with an agent?

[Jeff D.]

I have a buyer for my California acreage (that includes a large RV) and we agree on basic terms.  We'd like to hire someone to guide us through the transaction so it represents on paper, and to the title company, what we intended.  

Is that a real estate attorney? 

I can't easily find realtors by the hour.  

Must I list with a listing agent (they are asking 8%) even though seller and buyer agree on terms? 

I've bought and/or sold over a dozen homes the traditional way.  This time, I plan to carry a note and could also use advice to write it up safely for both parties. 

Who should I hire for this?  

Thanks!

P.S. The property is in Oroville, California.  It's roughly a $230K transaction with the RV representing about $30K of that.