House selling advice

[Al Ball]

Hi! I’m selling a single family home. My house is currently on Zillow “make me move,” so a thousand realtors have called me to try to get me to list with them. As far as I can tell, there doesn’t seem to be a whole lot they can do for me that an mls flat fee won’t acconplish. (But if anyone can tell me what exactly all their “magical” marketing secrets are referring to, I’m all ears :) I am a little unsure of what to do about negotiating offers, though. I’ve seen an offer to purchase before, filled one out, etc (Wisconsin). Is it really that complicated? 

But more, knowing how to negotiate multiple offers - is this rocket science? Is it more complicated than saying, “we got a better offer; can you come up?” 

If I sound a little clueless, I am. But I’m not dumb, and I don’t want to pay an extra $900 for something I can manage myself. 

Thanks so much in advance for any insight!