The 29 CFR 1926 standards are not the hard part. The hard part is applying them to a specific situation on a specific morning: whether a work platform counts as a scaffold, whether an excavation needs a protective system designed by a registered professional engineer, who has to be the competent person for the operation about to start, and whether the written program in your prequalification package actually covers the work.
Contractors usually reach out at one of three moments — a client or owner asks for documentation proving compliance, a compliance officer arrives on site, or a citation has already been issued and a response is due on a fixed timeline.