I get how difficult it will be. I have read medieval grimoires and alchemical texts. I can force my way through Ovid in Latin. Finnegans Wake is my favorite book. (Surprisingly, the Papyrus of Ani runs all throughout Finnegans Wake.) After finishing Finnegans Wake, I realized that the only remotely comparable experience would be reading books in foreign languages, so that's what I've been doing!
Of course, I was planning on reading some other texts first. Do you have any suggestions for reasonably easy ME texts to start with? I'd love to hear your favorite Egyptian texts in general, too!
Also, is this the book you mentioned? http://www.amazon.com/Middle-Egyptian-Introduction-Language-Hieroglyphs-ebook/dp/B00J8LQI26/ref=asap_bc?ie=UTF8
I couldn't find something with the exact title you mentioned, but it was the only thing on Amazon about Egyptian that had a third edition.
I memorise words using flashcards. The software I use which I have both on my computer and phone is Anki. I only have this for Greek and Egyptian. The other languages I do my best to memorise through reading and copying, same way I learned English two decades ago.
The textbook I use for Egyptian is James Allen's 2014 <em>Middle Egyptian</em>. I copy all the words and sentences in Unicode into Anki and study them every day. I also write the exercises into a Word document and also copy the sentences and words from the exercises into Anki as well.