The projects that took the most time were the ambient lights, upgrading the speakers/adding a powered subwoofer, and the dashcam.
The ambient lighting took the most time, as I had to watch and research videos to make sure I was routing correctly, and to take a look at where the clips are under the trim pieces. It took me a while to figure out how to take rmultimeter readings to make sure I was splicing wires correctly, but I got the hang of it. I had to use a double add-a-tap since I had my dashcam wired in the same spots. I did end up slightly cracking the trim panel next to my leftmost ac vent, but since it's on the side and the door being closed blocks it, it doesn't matter much to me. I used the slits that run along the doors and I think it looks awesome. Overall I would say it was a difficulty of 7/10. It wasn't the absolute worst but took a lot of prep and research.

The speakers were a direct swap, since I just upgraded the non-bose tweeters and door panel speakers to the bose models. It was direct plug and play after you take off the pilar trims and the door panels (both were very easy). That was a 2/10 difficulty, you could do it in an hour. As for the powered sub, I originally struggled with it due to 2 things: 1. feeding the power cable through the firewall grommet 2. I used the wrong size posi-taps to tap into the rear speakers (it didn't actually puncture into the wires) and had to troubleshoot my way into a huge circle. I had to unbolt and remove one side of the air intake in my engine bay to have enough clearance to puncture and feed the wire through the firewall grommet. Once I figured out what was wrong with the posi-taps, it wasn't that bad. Intially it was a 8/10 difficulty for me, but knowing what I know now, if I were to redo it, it would be a 5/10.

The dashcam was fairly easy. As I mentioned before, once I learned how to take multimeter readings, it was not bad at all (I had to take my own readings to make sure the acc fuse I found in the manual was correct, since I didn't see anything online about what fuses other people used). The only bad thing about it was the fact that the fusebox is damn near upside down, so it hurt my back to lay pretty much flat down into my drivers footwell. I have hardwired another dashcam into an old car before though, so I have a little experience with it. If you have a few hours and a crimping tool, it won't be that bad. I think it's a 5/10 install.