Biggest challenges being a solo real estate investor?

[Jack Porter]

As I've listened to BiggerPockets over the last 2 years I've heard horror stories of investors dealing with renters. 

I'm a college student looking forward to investing in real estate and wanted to ask, What are the biggest challenges faced by being a solo real estate investor? I imagine a solo investor as someone who doesn't use a property manager or any other service to help them manage the day to day activities of real estate investing. 

I hope this sheds some light on the day to day activities that are the most time consuming and frustrating that a new investor may not know about.

Thank you BP community! 

Jack Porter