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Nah, as hippy says that's the more traditional style, like he says, set limits, L can be done without the cable attached to make sure tension isn't affecting it, or just be careful, H should be with too much tension if anything, or pull on the cable if it's not internally routed, then set tension so that the trim gives you a bit of movement in both directions, newer old style ones need a fair amount of tension.
Yeah, get it dead straight after starting with it slightly wonky. Then get cable tension right so that the trim looks like it is right, then dial H limit in to push the mech out further to clear chain when in smallest rear cog, then check L limit for when in biggest rear cog. Kinda backwards order to older ones but they work great when set up. Cable tension makes a difference to how far out the mech goes, then you fine tune that with H limit.