1996 Buick Century.
The battery is mounted sideways and the terminals are underneath a few different unmovable metal pieces, and there are cables crammed in from all directions. There isn't enough room for a ratchet OR a properly sized wrench, so the only thing I could use was a tiny adjustable wrench. There was so little room to move it that I resorted to turning it about 1\8th of a turn at a time. Removing the battery terminals is by far the worst part of the install and took the longest of all the steps.
The front dash speakers are also terrible. The 4x6s are mounted so close to the window that there is only 2 or 2 1\2 inches of vertical space to move the ratchet. Once you get the screws half way out you have to just hold the bit and turn it by hand because the entire ratchet won't fit.
Also, the floor panels along the door ways are held in by 1 or 2 screws that are touching the sides of the seats. Which means you have to completely remove the driver seat to get to a single screw just to run wire under a foot of trim. The same has to be done for the passenger side.
Electrically its pretty straight forward but the car was definitely not designed with convenience in mind for anyone doing any of their own work.