To start off you can request a trial from http://info.nintex.com/Hawkeye-Trial-Request.html
For your On-Premise install you will need to ensure you have Nintex Workflow 2013 v. 220.127.116.11 (October 2015).
Then you can install the data collector from the Trial Portal and start generating reports.
Hope this helps,
When you sign up for a trial, you get an e-mail from Nintex with useful information which should be sufficient.
There is a 'Nintex Hawkeye Deployment Guide.pdf' included but I found the order in which the configuration steps were presented a bit confusing.
Please follow the order given by the installation:
Good luck and have fun. Cheers,
Further to the information provided above please be advised Nintex Hawkeye need to be deployed by the farm administrator on the Central Admin.
All other information can be viewed in the 'Nintex Hawkeye Deployment Guide.pdf' you receive when you download the package.