I did this first time a few months ago. I ran into an issue: my oil pan only took 5 L, but the car needed 6 L. I discovered that the hard way. Luckily I had a spare container, so the spill wasn’t catastrophic, but oil is messy tools, containers, rags all got greasy. My point? PREP is everything. Line the bottom, use large containers, have every exact tool ready, and it will be easy.