Self management is the way to go if you have TIE. Time, Interest, and Energy. It's a part time gig.
Even with your management fee, it's going to be hard for you to net what you do with a PM, assuming they do a good job. Number one, when you add up all of your fees to list on VRBO or Airbnb, you are at 10-12 percent immediately. So you aren't saving 30 percent. You are saving 20 percent if you are lucky.
You will also lose a lot of money over the course of a year due to opportunities lost, and opportunities cost.
Case in point: We had a guest check in on Sunday to one of our cabins. A weeklong stay. But their modem went out which meant no internet or TV. So the stay was in jeopardy. First thing Monday a.m., our manager drove 120 miles round trip to Knoxville to the Xfinity store, and had everything up and running by about 2pm. I am 1,100 miles away. Had I been self managing, I would have lost the $1800 stay and been struggling to get a replacement modem installed. That's big money to me.
A PM can fix things immediately that a self manager gets to fuss over remotely, while their rents are in jeopardy: Refrigerator, oven, microwave, dishwasher repair, heating/air issues, rodent infestations, lock-outs, TV/internet, plumbing, septic, snake in the house, broken chair or table, tree fell over into the driveway, you name it.
Everyone wants to say "Gee I'm saving all of my PM fee by managing myself." That may technically be true, but there is a lot more to that story.