Yes they are easy to use for anyone. There are two basic types:
Handheld – This is a stand alone unit so you do not need anything else for it to work and it powers itself from the OBD2 plug in your car. Great for people who are not to tech savy.
Device – This are OBD2 scan tools that connect to a mobile or tablet device. They can connect to android or iOS devices and use WiFi or Bluetooth to connect. These offer more options as you can use a number of different apps and create things like custom dashboards etc.