When quacks do your job

I work in the aquaculture industry, where different professional are expected to do various kinds of job, like construction of concrete tanks, installations of plastic tank and fiber glast tank, plumbing jobs.
some of this jobs, requires the services of professional to carry out the job or supervise it.
But some fish farmers believe they are expert and that can do the job themselves.
Unfortunately the result can be this

Same thing applies in other life situation at time instead of getting professional to do the work, we calling the quacks e.g

*seeking medical advice in social media or Internet
*asking for relationship advice from friends instead of seeing a counsellor
*doing a big party with a party planner etc

Handing over your job to a professional may look expensive but on the Long run it's cheaper and better