Do you know of anything which can help people get over the hurdle to know enough to use this content?

For me it's only worked when colleagues have explaining concepts to me when they were needed, after a several occurrences of this everything finally started to make sense and I could then make use of material like this.

There are no shortcuts with math. If you really want to learn it, you must be willing to put in a large number of hours over a long period time in order to master it. Are you willing to do that?