You realize HJ, if they are this dense ...
any advice you give them about plumbing might get them into deep trouble.
just saying.....
Not too long ago, a plumber asked me how to change a spark plug in a lawn mower. I chuckled to myself...."if they are that dense...."
The other day I asked my co worker how to interpret some statistical data because my knowledge of SAS was rusty and the new fad is to use "R", which I have no expertise of. He chuckled to himself....."if you are that dense......" . This same guy asks me for help changing caliper brake pads.
The skilled, licensed plumber I hired to complete my recent water softener install (after I did 80% of the work) was proud of his skills and detested the diy movement (especially hacks). I asked him if he took his vehicles to a professional garage for all of its needed work. He laughed and said "no way am I going to pay $90/hour labor for someone to install a ......shock, spark plug, pcv valve, etc.. He was a bit tight lipped when I pointed out the hypocrisy of his ways.
After these experiences, I decided to knock my know it all attitude (in one/several subject areas) down a few notches and accept that because I am an "expert" in some areas does not make me a better person than another that has expertise in other areas. Explaining things without being condescending will gain respect for both you and your profession. Just stuff I learned over the past 5 + decades, and I am certainly no angel by any means.
Rant....off. Not directed at you personally. But as a "jack of many trades, master of few", I wish the diyers and professional trades could meet at a better middle ground. Some services are akin to paying $20 for a tylenol at the hospital. I understand and respect the overhead costs, training, tools, etc.. I just want a better middle ground, paying fairly for the level of the work involved, if possible. Rant off.....again.