in plugins install "new Lightbox Standard"
Gather your pictures in a folder and in Photoshop make an Action to size them to about 1000px wide
In wordpress dashboard go to media and upload your pics
(you have sized them down so that they will all upload)
in Dashboard, go to New Image Gallery
add new gallery- Add Images
Play with Gallery settings- turn light box on
Publish! (otherwise nothing will happen)
Copy Image Gallery Shortcode
Paste into new page......and it is done! upload