To become a dialysis technician, you will need a high school diploma or GED. You will also need to get a degree or certification in dialysis training. There are many schools as well as online programs for this, just make sure you do some research and that the schools are accredit. You can check on sites like Ripoff Report and other consumer sites to see if the school has bad reputation. The training program lasts about six to twelve weeks depending on your school. Again, check out your local community colleges on what exact plan they offer. It's also a good place to talk to professors about the career in general.
While attending school, it's not a bad idea to look into internship programs over the summer. Your professor will be able to point you in the right direction. An internship will give you some experience and help you adjust to the work environment. It also looks good on a resume that you took the initiative and got into a program before you even started your career. Most importantly, you will be able to network with people and build up business contacts and relationships.