Mounce's Basics of Biblical Greek Grammar was a passion project for me! During the beginning of the Covid pandemic, I decided to invest in learning Biblical Greek. It is a decision that I have not been disappointed with! I did not begin with this book, but with Biblical Greek Book 1 and 2 of James and Lisa Cummings series (they have since in 2022 produced book 3). After book 2, having learnt nouns and the beginnings of verb forms, I felt confident to turn my attention to Mounce.
This book was a great, detailed teaching guide on getting me from my basic knowledge of vocabulary, verbs and nouns to being able to read whole verses of Greek independently. However, I do believe it can be overcomplicated for the reader at times. The book features lots of additional rules, or advanced concepts, or exegetical examples of Greek skills, but these things can be daunting when you are as the book suggests, simply trying to get your head around the basics. I found myself more often than not, skipping over these sections and just focusing on the basics, which I would recommend you do also on your first run through. The book does have a series of workbook questions to accompany each section, with answers that can be found freely online, thus providing plenty of practice with the original texts. Each section also has a list of vocabulary to learn, and by the end of the book, if I remember correctly, the learner had accomplished a 50x frequency of NT Greek (which is about 312 words).
Ultimately, it is a great book. I would not recommend jumping straight into it if you are unfamiliar with grammatical concepts or foreign languages. Instead, I'd recommend using this book to take you from a place of familiarity to a more competent understanding.