The tool can be deployed either locally or by using a Docker container. The Docker version is pre-installed with all of the required dependencies, so may involve fewer steps to get started.
The testing tool has a number of general configuration settings that affect its operation, defined in nmostesting/Config.py.
To alter these, copy nmostesting/UserConfig.example.py to nmostesting/UserConfig.py and make your changes there.
Further guidance is given in Usage.