landscaping crews have foremen that tell you how to do everything properly. You don't need any training. You just have to be able to do the work physically.
Yep, some will work with you for awhile and instruct you and others will just yell and let you figure it out yourself.
I worked for a ex drill insructor that taught cadidiots at west-point, believe it or not he wasnt a yeller and taught me alot.
I was left to figure out roofing my self and ended up getting hurt because of a few stupid mistakes.