Gaining expertise in cars/computers doesn't really translate to health medicine. It's a fallacy that I saw first hand, that say, some one gains expertise in one

Gaining expertise in cars/computers doesn't really translate to health medicine. It's a fallacy that I saw first hand, that say, some one gains expertise in one thing then feels confident to take on another in DIY spirit. A concrete example is someone who builds a shed that thinks they can do a bathroom renovation/remodel or build their own cabinets (don't look at me :P). Having to throw in the towel and hire a professional I saw: - How experts do things much faster (literally 1/3rd the time). - How experts avoid conflicts ahead of time/or deal with them as they arise quickly - How experts know the name of all the things ahead of time - How experts realize when a problem is out of their wheelhouse and requires a referral (electrical/plumbing/etc). I had to call it quits mainly because the DIY spirit is instilled into me by my father and love for tinkering. But I see it in my father, he tries to repair his own cars (with good results), because in his words mechanics are a scam and for the longest time I kind of assumed so too, but the truth is expertise is invaluable and what you are paying for is time/knowledge. You don't expect yourself to go to med school to diagnose your problem, someone has already done that and you can leverage that.