The company I worked for before getting activated (9-11) had a policy that if you went to the row crew, you started as a groundman if you had no training. Did the ojt thing till you could show competence at climbing. Worked your way up to manual tree trimmer, then aeriel basket tree trimmer. We had to attend monthly safety meetings, but these were mostly for the line crews. When I migrated to the line crew, we had a 3 year course taught by one of our engineers once a week at night and had to attend 2 climbing schools- pole stuff, no trees. I saw a lot of bad habits while on the row crew that I had to get out of my system when we started our own business.