Proofreading Adult Book 'Puberty'

I'm in need of an experienced proofreader for my second book titled 'Puberty.' Comprising of 87,000 words, this book is catered to adult audiences. The candidate should possess the following skills:

- A high proficiency in English grammar and spelling.
- Expertise in checking punctuation.
- Ability to evaluate and improve sentence structure.

The tone and style of the book should be informal and conversational after the proofreading process. This project will require a keen attention to detail and a solid understanding of the nuances of conversational language suited for an adult reader base.