I can add that there is a Short Term specific forum right here on BP. I've learned a ton from reading past forum posts but I will warn you that the majority of those on the STR forum lean towards self-managing. I self-manage 3 STRs along with 2 LTRs along with my full time W2. At first I did it out of necessity as property managers in my area were charging in the range of 25-35% of gross rents and at those fees, it cut drastically into profits.
Now that I've been self-managing for a little over 2 years, I've created systems to make things very smooth and I'm so glad I made that decision. I feel pretty comfortable now being able to scale to probably 8-10 properties with the systems I've got in place.
Good luck and as @Curt Smith mentioned...do your homework and own investigating. Call a few STR managers and ask what they charge and what they give you for that fee. In some places, even STR margins may be thin, so you'll want to factor your cashflow after PM fees. You may find yourself making as much as a LTR and with LTR, you're doing much less work.
Good Luck!