PDF, as a format, is inimical to eBooks/HTML. They are 180º different. PDF cares about what something looks like--not what it is. HTML/eBooks care about what something is, first, and what it looks like, second. I have an article about (some of) the problems, using PDF, here: http://www.booknook.biz/ebook-conversion-basics/ebooks-made-from-pdf/#378 . It doesn't remotely cover everything, but it tries to explain some of the problems.

Um...I guess, if you cannot afford a professional, your only route is to use a program like Calibre, to convert it to Word, and then, from there, clean the entire file. It's a lengthy and detailed process, but it's doable. Do you know how to use Styles and Headings, Tammy? If you don't, then, to be honest, you're kind of fighting an uphill battle. You should go here: https://shaunakelly.com/topic/word/concepts.html and start at the very beginning. Work your way through that page. All the way to the bottom. When you're done with those (I know it looks intimidating, but it won't take you more than an hour), go here: https://shaunakelly.com/word/styles/tipsonstyles.html and then, work your way through 1 and 2, on that page. Then go here: https://shaunakelly.com/topic/word/numbering.html , and do this one, at the bottom: https://shaunakelly.com/word/numbering/usebuiltinheadingstyles.html .

Those will give you the fundamental basics that you need, to successfully clean up a Word file, and restyle it, using STYLES and HEADINGS, so that you can in turn make a successfully-formatted eBook. There aren't any shortcuts to this. People will tell you that there are--and they know not of what they speak. Doing this is realistically the only way to get your file from PDF to a competently-done ebook, if you have to DIY.

Hope that helps!