Prior to boring the posterior TASIF bore(s), a pilot hole for each such posterior TASIF bore is optionally bored along or parallel with the visualized PAIFL, and the guidewire distal end is affixed to vertebral bone at the cephalad end of the pilot hole to provide the percutaneous tract for guiding a drill or other instrument to form the posterior TASIF bore or conduct discectomies or disc or vert