No tools needed to install the window visors, however I would recommend testing your windows by putting them up and down 5 times to make sure that the windows do not get caught on the rain guards (my driver side window needed very light adjustment so the windows could close correctly). There are other brands that offer the same thing but cost literally twice as much. For me, these cheaper versions are just fine.
Install Time: Instant
who drives a Honda Civic 2012-12-30
Installed very easy. Keeps the rain out and lets fresh air in. Money well spent.