I am a Minister of the Word at my parish…and usually (not all the time), whilst the reader is walking to the ambo to read the first reading, the priest will explain a tiny bit about what the reading is about, before the MoW begins to read, the same is usually done with the second one!
I think it’s good…sometimes not everyone will understand the reading and to have a little explanation of it before it is read allows people to understand it better.
As for MoW, when we are sent out our rotas for when we are reading, we are also sent a ‘readers guide’, which explains in one or two paragraphs what the reading are for say the next three months ( that’s the rota period). Our PP believes that this will help us to better understand what we are reading etc and I must say it works!