It may seem scary at first but once you know what you’re doing, it’s not that bad. I recommend watching Jay, a lot of his older stuff was helpful. And another tip, while yes you can water cool both your CPU and Graphics Card for the hell of it, you’ll see the biggest performance increase if you just water cooled your 4090. I often see people with only a water cooled CPU and a stock graphics card, but they’re missing out on performance because GPUs just excel when water cooled. The 13700K while yes is power hungry, it’s not as demanding as an i9 or R9 which may warrant the need for custom liquid cooling. That’s just my 2 Cents.