Deployed overseas and trying to sell, help!

[Zachary A.]

I've already got a buyer for a house near Sacramento California I want to sell, and both the buyer and I would like to move ahead without paying 6% to agents (I'll give him a better deal as well). I could really use some help figuring out what sort of professional assistance outside of a full service agent I will need to make this work. 

A little back story...

My buyer is the current tenant in the home. He's very interested and I wanted to move ahead, but I left unexpectedly on military trip to the other side of the world for at least 30 days. I'm looking forward to freeing up my equity and investing in real estate elsewhere (the house is not a great rental, and is actually costing me money). My tenant is a really great trustworthy guy, and highly qualified to buy the house.

Should I offer an agent a flat fee to help out? Considering that I've already got a buyer, what would be a reasonable offer to an agent? If I were home, I would start out by asking a title company for help, and do as much as possible myself, but I may need more help being away. What kinds of pitfalls should I be looking for? I only need to get the process started while overseas, I should be home before we close.