Eye check/compare tooth to xray, apply topical, inject and aspirate lidocaine or the anthesethic of choice, place rubber dam, drill, check, drill more, apply seek, drill more if needed, rinse, wash with cleaning agent (baking soda and water is what I have observed used) and rinse, etch, apply dentin component, apply enamel component, cure, apply composite/flowable/sealant if needed, cure, repeat as needed, take down excess composite, remove rubber dam, check occlussal, take off more excess, repeat as needed. Pretty simple with practice or enough observing. Crowns pretty similar. It's knowing when to use sealant or flowable composite vs. composite, or when the patient doesn' t need to be numb and things like that I am sure we'll learn in dental school WHEN we get in. And obviously a ton ton ton of practice.