It should go without saying that the pagination of your manuscript will never match that of the finished typeset book. This means that you cannot insert actual page numbers in any cross-references within the text. Instead, you should refer to entities like ‘Chapter 3’ or ‘Table 5.1’.
Indeed, although a few well-placed cross-references can be useful, they should only be used where there is a significant benefit to the reader. Having to flick backwards and forwards through the book may be OK once in a while but more than that is annoying.
Moreover, cross-references can be counter-productive. All too often, they distract your readers, taking them off on wild-goose chases to remote regions of your text. The danger is that your readers will lose the thread of your argument or, worse, lose patience altogether with your text, perceiving it to be badly structured.
Finally, remember that cross-references can be plain wrong. There is a risk that the text that you are referring to has been moved – or even deleted.
In other words, handle with care.