Glow plug change question

Morning peeps,,

first post for a while as all been going pretty good with me car 

I purchased the Ross-tech reader to diagnose any issues with the car and hey Hoe she had a few that my cheap reader don’t pick up

says glow plug cylinder 1–fault

O2 sensor—- fault (rich)

air quality sensor—-fault 

turbo actuator——fault

EGR——fault (intermittent)

how easy are plugs to replace ?? Done them on a focus so have a basic idea 🤣

thanks peeps