I'll "third" that. Any spray painting I've done on bikes always has "orange peel" finish, not high gloss. It doesn't matter how light a coat I apply etc etc.
So if you're happy with amateurish, you DIY.
Wise move to find a professional. There's a wide range of charges. I was quoted $400 for a pannier and mirror, which seems ridiculous to me. I paid $67 for three cans necessary for Candy Glory Red, and got my orange-peel effect without even trying.