Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding Guides Basic model replacement for an armour piece

I can confirm this is absolutely the correct way to do this
Good step-by-step approach.

I will say, checkout in step 9 is also be possible by 'right-click' > "Open For Edit..."

Also, you can make sure the override worked by looking if the original resource now has a grey background and a right-click option "Go to Active Resource..." which when clicked opens your package where you placed the modded resource.