And I see that lay people can be helpful too; you don’t have to know everything. It would be so helpful to have a very accessible, layman oriented book on the topic of the RT.
I'm not sure what you mean by the "RT" (whether that is for you the TR or the Byzantine text type), but I have found the writing of Maurice Robinson to be very helpful with regard to Byzantine text-type arguments. In fact, I find his argumentation compelling. A lot of his stuff can be found easily online.