Raspbian 2018-10-29 Headless Setup
Setup your RPI without a HDMI display and/or using WIFI
For this guide I'm going to be using Raspbian Stretch 2018-10-09 (98444134e), however it should be the same for full Raspbian.
Where needed I have tried to include both Windows and Linux instructions (I currently run Linux), the Linux instructions should be the same for OSX with some tweaks.
Disclaimer: I am no way responsible for any data loss or problems you occur, proceed at your own risk. Feel free to drop a comment below if you encounter any problems.