Assuming that people have the expertise to do it themselves, which I don't and I don't plan on doing so anytime soon. Knowing me, I'll mess something up and damage, costing me more money than the new hardware by itself. I'd rather have a professional do it because I don't know a damn thing about cars or wiring, soldering, etc.
Yes, it costs more, I'm well aware of the extra costs or what have you, but if I did it myself, something is going to get ruined, that's not being mean to myself, that's being truthful about my lack of skills
If I was going to have to do it, I'd have to watch someone do it and for there to be the person who did it there to guide me. For me to simply watch a YT howto a million times doesn't help me at all unless I had a person to walk me through, but that's just me.
I refuse to do this crap on my own, gonna be a cold day in hell before I have the balls to do it myself. Without the proper tools, or the skills or the confidence, no way in hell it's gonna happen. Just saying. I know it costs more, but I feel better trusting a professional, someone who has had years of experience.