Fair enough, this fluency shaping thing does sound exhausting. The McGuire Programme technique is nothing to do with changing the way a sound would normally be said, I think in Australia we call "fluency shaping" - smooth speech (but I may be wrong), which is completely unnatural and would be a strain to maintain. The McGuire Programme focuses on proper pausing, breathing and saying words properly, so the only tiring thing is remembering to use the McGuire taught "costal" breathing every time we speak. The other exhausting but fun thing is most of the McGuire grads tend to become a bit more proactive in pushing out of our comfort zones, so it gets hard to continually push the status quo speech wise.