Gt86 service

Hey all, it's my first year of ownership and the yearly service for my 2014 gt86 is coming up and I wanted to get some advice.

Is it recommended to get a Toyota garage to do the service or is a known local one fine? Is there anything I can do myself beforehand or just let the garage do it all. I know an oil change isn't hard and recommended after 5k miles, I haven't reached that point and a service should come before that mark anyway.

I'm not sure if sparkplugs count as a normal service but I believe they're also something recommended to do yourself if you can.

Thanks for the advice and help