In many cases, the apprentice's first job was to build his tool box, then his ladder. For hundreds of years, workers made their own ladders and kept them repaired. Many lasted generations. Modern ladders are mass-produced items with specifications limiting how they can be used. New laws and consensus standards apply to the exposing employer, and to the controlling employer on each work site.
Employers have greater responsibilities.
Among those, is the duty to inspect the job site where your employees will work. You are required to assess fall hazards and create ways to prevent falls. A competent, trained person is required to provide your training. Training and retraining is mandatory. All climber training will be carried out by a competent person who knows safe ladder practice and the proper way a ladder can be safely used in your production process.