Agree with all the post but with this in spades as it is absolutely my experience. And it has been difficult.Everyone has a limit, I suppose. And that limit is probably proportional to the amount of time we play / practice.
But, even if you have the worst, most unnatural swing ever, changing even the slightest thing to make it better will actually feel horrific, as it isn't natural to you. Furthermore, even if you change that thing, there will then probably be other issues within your swing that cause huge problems, as before they worked as they compensated for the flaw you are now trying to fix. So, after a lesson you probably need to embrace the fact you are going to play horrifically for a while, but commit to the change. At best, your body will gradually eliminate other flaws that are no longer required due to the change you are making, although it might require follow up lessons every few weeks if it hasn't happened naturally.