I finished installed my Thinkware Q800Pro today, and it wasnt difficult at all.
Few things I'd strongly suggest is getting trim removal tool, it'll definetly help get the fuse panels off nice and quick, and will also allow you to tuck wires in the header too.
another thing to hard wire this dash cam, get two mirco2 fuse taps, In the passenger side fuse block. one for ACC power, and one for Battery power. You won't need to cut into the system wiring at all then.