Formatting for Kindle was a bit of an adventure, but I finally found a great resource, Format Your eBook for Kindle In One Hour. Not only does he walk you through it step by step, but he includes an HTML template. Do some basic formatting in Word, drop it into the template, follow the rest of his steps, and you're done! It took me a little longer than an hour, but most of the was Word's fault. Boy does it add a lot of extra, stupid stuff that you need to get rid of to create a clean copy, ready for HTML.
It is designed for fiction, but it looks like I will be able to make it work for Enthusiastic Networker since it's mostly text. If you have lots of graphics or tables, it's not sophisticated enough to handle those, but there are other resources out for that
If you are in the middle of formatting, try the book. And feel free to contact me if you have any questions. Glad to help fellow authors!