I am a broker - will put that out there right in front- in this market pricing is changing dynamically. When I work with a seller and give them listing comps, I pull new comps the day before I list it because pricing is ever changing. Some homes are going for $60-$100k over list price, so by not listing you could be missing out on that upside of this low inventory, ultra competitive market. You might also be missing out on terms that buyers are offering to net a sale. My last listing had multiple offers, appraisal gap language - meaning the buyer would bring money to the table if the appraisal didn't come back at value, PLUS many buyers are offering to waive inspections and release non-refundable earnest money prior to close. Those are all benefits to you as the seller. You only get those by putting the listing out there and allowing buyers to compete for it.
The other thing to importantly keep in mind as the seller, you are required to disclose certain information. Not doing so puts you in potentially liability. If you get sued, you are on your own. Using a realtor, the realtors insurance takes the hit, not you personally. The realtors job is to act as your fiduciary, maximize your value and protect you from litigation.
Happy to discuss with you.