By my understanding, what you require is a thorough copy editing of your personal memoir. Like I wrote in my description, my family includes two literatures professors (English and Hindi) and, as is the natural consequence of such, I have a very strong grasp on languages. Additionally, not only will your memoir go through my own personal copyediting process, but I will also pass this on to my grandmother such that there are two separate pairs of eyes copy editing your memoir. Also, as an additional comment, length isn't much of an issue for me. I have a habit of finishing a book a day (and considering my interest is in political thought and theory, each text is quite heavy). Length isn't an issue for me.
The only thing that I would require from you is some guidelines on what elements of writing you would like to retain. For example, certain people have a habit of writing in a passive voice (think "is", "was", etc.), whereas general English guidelines dictate that an active voice. For the sake of an example: "John is running through the park" is passive voice whereas "John ran through the park" is active. All that I would require from you is some basic instructions as to what characteristic elements of your memoir you would like to retain and, after that, you can leave everything else up to me.