I followed car care nuts…
I followed car care nuts videos and diy my 2015 Highlander at 60k miles. Plugs may be early at 60k but it was 8 years old at the time I did it and the car don't see a lot of highway miles so it's best just to do it in my case. It went well with no issues for a few hours of my time and less than $100 in parts. I also changed my serpentine belt, Flushed coolant and brake fluid a few weeks later.