Installing new refrigeration systems is easy for people who use common sense. Legally, you still need your EPA license if you need to add refrigerant. If you have the tools, it's probably going to be easy for you. This will not put anyone out of a job. There are plenty of people who do not want to do it themselves, and who'd be better off doing overtime at their job and paying someone who has experience. Also, if you don't have the tools, it's probably not worth buying the equipment just to do your own home.
I wish we had more people who did things themselves. Too few people spend the time to learn new things, which is why people kill themselves.