A few posts back Pete talked about the length of time it takes to really train someone. I think he took what I was clumsily trying to say and put it much more eloquently.
It sounds like you are trying to basically build a company up, and unfortunately that can be a slow and painful process. When I worked at Bartlett in Pittsburgh, the shop had been around since the 50's and developed a bad rap in the division for shitty work and a lot of accidents. They brought a couple younger foreman up from different shops in the region, me being one of them, fired a bunch of the problems, and hired several new guys. I worked with a totally green guy who had just graduated from Penn State for over one year and taught him everything I knew about tree work. I was only 27 or so at the time and didn't know a whole lot myself, but I was a foreman and that was my task. It was a frustrating year filled with long days, shaky rides on removals, dull/poorly filed chainsaws, and the like. I have a scar on my arm from a rigging line incident during that period. That guy still works there and is an awesome arborist now. I still do side work with him on the weekends. ( I left tree care two years ago for a job as a utility forester for the power company here.) The point is that it takes time to train someone to do this job and you can expect some pain, unprofitable days, and hurt feelings while you are doing so. If you want to have a tree company, you're going to have to commit to this.These guys need more than just you reviewing the portawrap on the ground and then heading up the tree. They need to watch a pro on the portawrap lower some pieces in front of them while receiving instruction. Let THEM hook the truck up to the chipper while you spot them so that they can understand why they need consistent signals. Youtube videos, Arbormaster, Beraneks stuff, this forum, etc are all just a supplement to doing it and seeing it in the field everyday.The best that I can tell you is to be patient, set a good example, establish a firm culture of safety, and keep on taking the time to explain things. Your situation is really no different than what most folks experience in tree care IMO. You'll get through it.