I will start with a brief story, but the question can be generalized.
Last year, I decided to do something for my body. I joined and regularly went to K. Training (abbreviated name), a large gym chain in german-speaking countries. The claimed philosophy is different from many gyms: there is no music, no proteine shakes to buy, mostly old people around, and insistence that it is about strength, not show-off, and that strength is what keeps your spine together etc. They have no cardio bikes, no barbell, only machines, and the high-intensity approach is that at each machine you do one continuous exercise for two minutes. If you reach the two minutes, increase the weight next time. It all seems very serious, there is an orthopedist you talk to when you become a member. It all has been in existence for some decades. The founder writes books, of course mentioning that his approach is the only one that works against pain, and that he is not heard by the mainstream. While at the same time they have contracts with many orthopedists and this is part of the marketing.
Now, a back problem. I have seen several orthopedists in my life, but the one I talked to this year (after two GPs, both clueless) is the first who seems competent and also listens. His comment about K. Training: it's ok, but sometimes hard to leave the contract. You could just as well try Yoga or Pilates. Anyways, he gives me a prescription for physical therapy.
Talking about this and that, the therapist speaks out against K Training, because no warming up / cardio (something the founder explicitly defends in his books), and Yoga/Pilates/etc is better anyways.
Then I googled again. Seemingly, gym experts all have their own approach. Some agree to the high-intensity two minutes thing, others disagree.
Then there is also Mr. L.-B., an anti-pain guru with a somewhat different approach I dont really understand, again against the "mainstream" but also against K. Training. And from a lecture of his that I watched on youtube, he seems like a snake-oil seller; but then, he (of course) has many fans.
Now I could just randomize what to do; or try to really read about approaches, but ALL of them seem plausible, if you listen to them. The investment necessary for actual judgement would be studying medicine.
So long story, short question: how do you actually handle such cases of pratically relevant epistemic learned helplessness?