I Am Thinking About Becoming An Echocardiographer (cardiac Sonographer)?

I was wondering what the job is really like?

I may want to get bachelors in this field to be a bit more competitive. I chose this one because I hear it's on of the fastest growing jobs and I do like helping people. I was majoring in Dietetics/Nutrition but the chemistry is just so difficult, it's truly a chemistry major, you might as well major or minor in chemistry along with Nutrition.

I wanted to also know if there are schools that specialize or have this major specifically? Or do you have to be a regular registered diagnostic medical sonographer first? I was going to go into sonography but I got turned off when they said I would have to do more than I expected (like insert some things into rectums and vaginas and such). I would rather look more into hearts. I am confused because I think I heard there are some schools where you can specifically get trained directly for Echocardiography but then I see others saying that you have to be a general sonographer first then specialize? I live in Minnesota (midwest) if that helps.

Also, if you know, what kind of classes would you take? What would the schooling be like?