Electronic boarding pass or paper? We often prefer an electronic or mobile when not checking a bag which helps you skip the airline counter all together. The main tip we have is to take a screen shot or save it to your phone before you head to security so you do not run into issues where there is a pour internet signal once you get in to the security area. Trust us on this one.
Also, most machines read the boarding pass best when the screen is fully lit so you may need to adjust your phone settings.
Lead. Travel. Pray. 