If you want the truth, take no one else’s word for it. Accept only science, reason, and direct experience. Start on solid ground. Mind each step.
Alas, there is no Popperian science. Even Lakatosian science is an idealization, albeit a less comical one. Close study shows that science is, as Einstein acknowledged, a ruthlessly pragmatic practice, in which all "principles" are ultimately discarded in favor of whatever works.