There is no need to use bookmarks for this. All you need do to navigate to a footnote or endnote is to double-click on the footnote/endnote reference in the document. To return to where you were, simply double-click on the footnote/endnote reference at the start of the click on the footnote/endnote itself.

Alternatively, with endnotes, you can split the document pane so the endnote range is always at the bottom of the screen and the body of the document at the top.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]