2012 -2018 ford focus catalytic converter replacement

I couldn’t find anything step by step on YouTube so I hope this helps. Got it off eBay for 100$. O’Reillys quoted me 700$ for a new. EDIT: DO NOT GET THE EBAY CAT! Within the year it blew out into the second clogged everything up I needed 2 new cats. The O’Reillys one was 400$ and is completely worth it