You don't have to inherently know how to build a PC, but there are step by step guides on the internet. 25 years ago I used a guide from https://www.tomshardware.com/ to build my first PC. Nowadays it's even easier, you can go to https://pcpartpicker.com/ and filter the builds according to your budget and specific requirements.
I don't get what is the problem people are trying to solve by not allowing cats on the counter. If you are doing food prep, you need to use the cutting board. If you are doing it on the counter, you need to clean it first, whether you have cats or not.
Or you can just stick to the marked runs. Off-piste skiing is always more dangerous.