For future reference if you do it again, I promise it's simpler than you think. If you can build a computer, you can install a head unit - especially if you get all the right adapters cause then you're just splicing labeled wires. The only part that could be considered "difficult" on the ones I've done is getting over the hesitation to pull relatively hard on the dash/body panels to get faceplates and such off. You typically have to pull hard enough that you're sure it's going to break, but it isn't.
Really it only starts to get difficult is when you replace speakers, add an amp/sub, or run wiring beyond just splicing stuff behind the dash
ALL THAT SAID however, I can relate to the wanting to pay a professional. I did my last three cars myself, including up to adding an amp and replacing all speakers and wiring, but the most expensive of those cars was only 12 grand so I wasn't too worried if one of the corners of the door panel on one of the rears was a little loose, or I had to kinda butcher the stock tweeter mount a bit to fit mine in because it's behind a grille anyway so I'm not gonna see it again. Plus, there's value to having someone else to yell at if it goes wrong vs being disappointed in my own skills. So with my FoST, I had BB do the speakers