HCM Data Loader - How to Guide?

Summary

Is HCM Data Loader too complex for a non technical HR rep to use?

Content

I would like to change the user name and email address for several of our employees.  I understand the tool to achieve this is to use HCM data loader.  I have only used HCM Spreadsheet data loader before and am not sure if I have the technical background to successfully upload data using the HCM data loader.  Feeling intimidated...

I have reviewed the 'HCM Data Loader User Guide' - and the 'Loading User Update Requests Using HCM Data Loader' white papers. Does anyone have a simplified "how to" set of notes on how to use HCM data loader?