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But I’d liken it to the guy that wants to climb Everest or El Capitan without any mountaineering or climbing experience.
The big difference being that if you fuck up Everest or El Capitan, you die. If you fuck up making a garage door, you can have a big bonfire and try again or get someone else to do it. But you don't die.
I've tried a few things in the past I wasn't really qualified to do. Nearly died a couple of times, broke a few bones, but lived to tell the tale. Compared to them, trying to build some garage doors is frankly small fry.
As was pointed out - quality and reliable door building, like what you want to attempt, lives and dies on the quality of the joinery. Shit joinery. Shit doors.
Regardless of how you feel about how people have opined about your plans, I think it’s reasonable to say it’s be wise to become competent with the requisite techniques before attempting such a tricky project.
I get it, you see the challenge and you are competent in the other aspects of your life so it seems reasonable to give it a go. But I’d liken it to the guy that wants to climb Everest or El Capitan without any mountaineering or climbing experience. You could in theory do either with almost no experience and just prepare extremely thoroughly for the task and still succeed, but the vast majority of experienced participants would recommend you start with smaller steps.
Also, it’d be shit to get to the end and realise you didn’t do the first bits well enough for the doors to be any good. Or you might relish the opportunity to get it right at all costs, no matter how many errors are made along the way, and how much needs to be redone.