To the extent that Epíkouros' Book Fourteen On Nature is not a direct refutation of sections of Plato's Timaeus, it certainly presupposes familiarity with the material. Before we go through this in the upcoming Wednesday meetings, ideally, we should develop the same common ground.
There are several good audiobook versions on YouTube. Please find your favorite reader and listen to it at 0.80 speed until you become as infuriated with Plato's math-magic as Epíkouros is in Book Fourteen.
"This is also desirable: that one who is entirely afflicted by such over-questionings has a kind of remedy – through which it is possible that a simple condition [of life, focused] in the observation of nature will set free their innate trouble."
--Epíkouros, Peri Phýseōs, Book 14, P.Herc. 1148 col. 24