I own a commercial refrigeration service company- we work on supermarkets, and the like.
I work with my hands every day. Over the years I've accumulated a large heated shop with a MIG welder, several torch sets, a big compressor, a blast cabinet, a pressure feed sandblaster, a soda blaster, a powder-coat gun, three paint guns, a 2 post lift, two work benches, a drill press, a bench grinder, a heated pressure washer, 2 roll-away chests full of tools, and a lifetime of experience with mechanical stuff.
With all this at my disposal- there are quite a few things I pay somebody else to do, precisely because they do it better, faster, and cheaper than I can do it. I'm good at what I do, and people pay me well to do it. I'm WAY ahead to do just what I advised you to do, and let somebody else do what they're good at, while I do what I'm good at. I've done all of it, but I've distilled down what I'm good at. I do those things, and leave the frustration for somebody else.
If it's a matter of picking up some skills, then by all means- knock yourself out. But if you for a minute think that you are going to do this faster, better, or less expensively than you can pay somebody to do it for you- you sir, are mistaken. Nearly all skills of this type are learned well before your 30th birthday, most are learned before your 20th. Your crazy-skills in one area are likely only going to highlight your lack of them in another, and frustrate you.
If it's cubicle-therapy, then go ahead- but keep in mind that you've got a long haul ahead of you, and a couple of lines on the gas tank is just the tip of the tip of the iceberg. I'm guessing that 6 months from now this project won't seem too much like therapy. I hope I'm wrong. But for every 50 guys that starts a build in his one car garage with $200 worth of Harbor Freight tools and a dream, there's one that finishes.
It's harsh, but true. Dumb? I'll concede it was dumb when you finish.
FWIW, your quote proves my point, not yours. Something from H D Thoreau would have been better- perhaps: "If one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours."
Perhaps. But, I'll stick with my advice- forewarned is forearmed.