Just remember to turn the power supply on. -.-The only part you can really go wrong in a pc is A. you tighten the crews to much and your motherboard snaps, B. you plug in the wrong cables and fry your pc, C. you break a pin on the CPU. But overall its not hard to build if you take your time and be careful with items such as the CPU, read all the guides that come with the parts and you should be fine.
Why why why whydon't don't don't don't don't don't don't don't don't don't don't don't don't don't don't buy pcs. make them.
https://pcpartpicker.com/list/KjZppb
This one is so much better than the one you are looking to buy.
Tips:
order from that site's suggested sites to get the cheapest products
you won't break it
Google is your friend
