Guide to gyro and accelerometer with Arduino including Kalman filtering

You should use either the complimentary or Kalman filter or you won't be able to make it balance!
Sounds like you are not that happy about your co-workers? :wink: What is your profession?

See the following example on how to include the Kalman library: https://github.com/TKJElectronics/Example-Sketch-for-IMU-including-Kalman-filter/tree/master/IMU6DOF/MPU6050.
The simply is to simply add it next to the .ino file and then add it like so: https://github.com/TKJElectronics/Example-Sketch-for-IMU-including-Kalman-filter/blob/master/IMU6DOF/MPU6050/MPU6050.ino#L19.

Hope you will get it working before your deadline!