That's the problem with this hobby. At least for me; if I think I can do something myself; I will invest in the tools and the time to learn that task. Plumbing was one of the 1st things I tackled (many many moons ago); all because of my buddy with his '67 Chevelle. That car would go into the shop for something like fuel line replacement or a similar task. I don't know how much my buddy spent on that, but I look at it as something I didn't need to spend money on. So, I bought AN wrenches and a Koul Tools hose end kit and went from there. I have 2 sets of wrenches and AN vice jaws (for keeping the fitting in place while you wrench them together). AN wrenches are aluminum and are needed for the aluminum fittings. That's it for those tools.
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Regular AN lines are not particularly hard to assemble. You use the Koul Tools hose end tool to jam the braided rubber hose into the hose end. Then you take the hose and hose-end; then place it in the vice jaws. Dab a little oil on the end of the cone on the fitting and jam it into the hose until the threads make contact. Then you just thread the fitting together; it does get harder to turn the further you get in; but it goes together.
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The high pressure fittings don't require any special tools. You need a small flat-head screwdriver and regular wrenches. Because the ptfe lines are teflon-lined; they won't go together like the braided rubber lines. The fittings for these resemble plumber's compression fittings; and thus have ferrules to grab onto the teflon lining. Good thing here is that you don't need special tools. You start by putting your hose-end sleeve onto the hose. Then, carefully poking a small flathead screwdriver in between the steel braid and the teflon lining, you separate them the length of the ferrule. Insert the ferrule over the teflon lining. Then cut the splayed steel braids back with tin-snips (preferably a new sharp set); this is done so that when you slide the hose-end sleeve over the ferrule, the steel braids don't get into the threads of the hose end. Then you place in the vice jaws and thread the fitting together.
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Of course, this is all covered in detail on YouTube. If I had YouTube when I was in my teens and 20s, I would have done a lot more of this work at a younger age.