Overclocking is fun.
The main purpose of overclocking is getting the maximum out of your hardware and pushing the limits.
Pay attention that you need high-end CPU, MB, decent cooling (case, fans, cpu cooler), a good PSU (not just decent). When overclocked, your HW using much more power. It's not a big money per month, but for the 4-5 years it's considerable amount.
So in the end, you might get cheaper with upgrading mainstream HW every now and then when you reach the limits of performance.
A practical overclock, one that is safe to use everyday, is about 20% on the CPU and 20-30% on the GPU.
For an intel CPU it's equal to 4-5 generations which is 4-5 years.
For the GPU, it's kinda 1 gen (1-2 years).
So it's up to you to decide if it's worth it. It is rewarding
As for the ease, once you understand the basics, it's not hard. especially for the practical overclock.
The LN2 with custom power boards is more complicated.