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Once I'd practice-plumbed the entire system (you can push the A/C hose into the fittings without crimping them to test-fit) it was time to crimp the hoses. You'll highly unlikely possess the correct, and very expensive, tool to do this, so mark all the joints with a Sharpie (arrows) in a place where they won't be seen to preserve the alignment, and take them to your local specialist store. Straight fittings won't need marking but any angled fittings will. I ensured that the writing on the hoses was at the bottom, and therefore unseen in the final installation when I did this.