I had to teach myself because my mom shops like yours does and that is how we were raised. I suggest one step at a time. Small changes are easier to integrate into your life especially when you've got kids. I find that soups are a really fast and easy way to start when it comes to from scratch meals.
My mom takes pills to counteract the effects of her other pills and all kinds of scary things happen with her health. The funny thing is that most of her issues could be controlled with a change in diet.
My mom's poor health and diet was as a strong motivator for me.
That reminds me, I wanted to try making homemade chicken noodle soup. I will have to look up the ingredients and write them on my list. I am a big believer that diet and lifestyle would fix a lot of our problems. Maybe not all, but most!