... a friend of mine became a plumber after he couldn't find a job as a computer programmer. Actually, he was my mentor.
Anyway, he started off at Roto-Rooter, and after about 20 months or so will be licensed and able to start his own biz.
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Plumbing isn't hard, but it can definitely get messy.
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I would imagine that the changes in plumbing are much less hectic than for an electrician. Electricians are expected to be able to wire in digital, intercoms, controls, home theatres, etc. etc. Plumbing has PVC, copper, iron, and maybe a few alternate plastics, and THAT'S IT!
Well, I worked for a plumber one year when I was being a bum before going back to computer work. I'd rather be doing computer work, mostly.
The thing is, construction work, especially the specialty trades, are great, if you're doing new construction. Repair is a whole 'nother thing. In fact, right now, I'm working on a friend's boiler (hot water baseboard heat), and it's a major pain due to someone else's previous expansion of the system, and the cramped quarters. I once plumbed an addition to a house where it looked for all the world as if they'd put in the water heater and furnace, then built the house around them -- burying them in an impossible crawl space. I've done a little electrical work too, and I'd much rather do that than plumbing repair.
Once, my boss and I were doing some repair on ramshackle mountain "house". It involved rerouting part of the main waste line. I was topside, running parts etc. from the truck, while the boss was in the crawl space. We told everyone not to use the sinks or flush the toilets ... (yeah, he heard it coming, and got out of the way in time).
I've gotten a few 110 shocks. Preferable to sewage, I think.
A friend of mine tried working for Roto-Rooter. He had to pee in a cup to get the job.