Last time i setup docker for some quick testing i had to:

1. Install docker using Apt or Yum 1a. So for CentOS i had to download and run a script on my machine to add the repository and install. 1b. Setup autostart of the service 1c. Configure my user so i can manage docker without sudo.

Then once its installed: 2a. Lookup the correct flags to use 2b. Find the correct image to run 2c. Learn how to map a local folder for persistence 2d. Learn how to open ports for the program to be accessible.

As a system administrator with 15+ years of experience, this is easy for me. But if I where to ask someone without any system experience to do this, I can for-see a lot of frustrating moments where they would give up.