I answered the question saying my Rav told me it’s better to learn the halacha and not yet implement it (as opposed to avoiding learning it at all in order not be held liable), because if you know the halacha, at least you have a chance to eventually putting it into practice. And in the meantime, you’re not chaiv. One should only put the observance into practice once they can no longer stand the idea of continuing to do the aveira.
For instance, if one wants to drive a long distance on Shabbos to get to shul, and that’s where they are currently “holding,” then so be it. Let them come to shul. Eventually they will no longer be able to “tuen the key in the ignition,” but this means they’ll likely stop coming to shul. This is a dangerous transition time when you can lose a B’T. So it’s imperitive to encourage them to move into an eruv once they no longer are willing to drive on Shabbos.