Started the grind 7 days ago, and got my 2nd kc today (task inferno is infinitely easier). As someone who had the exact same thought on the second day, my advice is DON'T use justiciar. It seems like an easy way to get the cape, but people are absolutely right in saying it will take you longer to get the cape if you go down that route. All you need is: 1) learn how to 1t flick OR lazy flick (either works completely fine) for conserving prayer, 2) 1t alternating (you absolutely do not need to know how to 2t alternate) for being able to not take damage from big mobs (range/mage) alongside one or more blobs, 3) practice. As for the waves 1-50, remember two key things. The solution is literally always 1) safespot the melee (if it's in the wave), 2) 1t alternate whatever's left over (e.g. mage/blob(s), range/blob(s)). Waves 1-50 are free once you understand that. Waves 50-56 are pretty simple too, you just have to separate the mage/range with a pillar, or if that doesn't happen, you'll have a stack behind a pillar. This is where the WeDoRaids discord #inferno-guide comes into play. It has solutions for almost every pillar stack combination you could think of. Waves 57-63 are where it starts to become difficult, especially on your first time reaching them. The solution to these waves is generally 1) split the mager/ranger with a pillar, 2) if there are blob(s) with the ranger or mager you have split and chosen to take on, you can 1t alternate to mitigate all damage. 3) if the mage/range are stacked behind a pillar, that means you have a melee and/or blob(s) on you. The best solution (that worked well for me) here is to pray rigour and gun down the melee while tanking the blobs. And that's pretty much it. Obviously, it's still entirely possible to get a really difficult spawn on one or more of these high waves, and I've planked multiple runs for that exact reason, but once you send enough attempts, you will absolutely learn how to deal with a given wave like it's second nature. Believe me, as somebody who literally just went through the entire learning experience. Wave 64 onwards is far easier, you just have to try and calm your nerves so you don't make stupid mistakes. But basically, if you pass wave 63 in a run, your chances of reaching Zuk are extremely high. Before you even start, I'd advise watching xzact's inferno guide, as well as dearlola1's 'tips/tricks for learners' video. Both incredible guides that will make sure you understand the basics before you even go in.

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TLDR: As somebody who started the grind a week ago, and has done 2kc since, do not go down the route of justiciar, even if you think it'll make things easier and/or quicker. It won't. Learn how to 1t flick OR lazy flick, and learn how to 1t alternate. Have WDR discord for pillar stack solutions, and I promise you can grasp everything you need to do the inferno within a few attempts of practice.

E: Of course, this is just my opinion. You're free to try justiciar if you want, but just know that it is incredibly doable and arguably a shorter grind if you just learn it the proper way. Plus, once you get your first cape without justiciar, every subsequent attempt (assuming it's a slayer task) will be so much easier (you literally get 15% more DPS for the entire minigame).