I agree - post grad.
I "wasted" my first 2 years as a physio and couldn't even justify why you would do even a mobilisation. The treatment I was giving people was "right" because I was told what I was doing was "right" by my seniors but I couldn't understand why nor could I get a decent explanation about things.
I then started doing courses - the turning point was a Manual Concepts course "Certificate of Spinal Manual Therapy" - see
www.manualconcepts.com - which set me on the path to learning.
From there, it was Barb Hungerford courses which led me to Diane Lee and LJ Lee, Trish Wisbey Roth,Peter O'Sullivan, the work of Paul Hodges et al, etc...
Until then, I was a typical Sydney-Educated physio who comes out thinking that we know it all in Sydney!
Find someone to help guide you in your learning is the best...