How they're installed? They're just stickers, so they're not really "inlays" at all, you just stick them on
Check out my music:

"Swing your hips, not your fists"- Cedric Bixler Zavala
did you read the description? it says that the stickers last like 6 to 7 years, I really dont care about the inlays in my guitar but those stickers seem reliable and they only cost $13
I'm not going to tell you whether or not to buy them.....just please don't call them "inlays".