Here is what I have been told:

To successfully have a WILD you need to lay down in a comfortable position, and basically just stay conscious until your body falls asleep due to no external brain functions. WBTB also plays a key role I know, and so does your REM cycle. Also, mantras and self-motivation help stay conscious but what I'm wondering is: Is that all there is to it? Am I missing something? Another note is that yes, I have read the tutorials on WILDing and WBTBing.