If you can test the glow plugs for continuity and verify that the glow plug circuit is working correctly, I wouldn't use any ether. If you do use ether, make sure you disable the glow plugs to avoid any disaster. What I would definitely suggest is making sure you have two good batteries, keeping in mind that you really have to spin these motors pretty hard to get them to start. Also, I wouldn't spin the starter for more than 15-20 seconds at a time and let it cool sufficiently or you will toast the starter and/or cables. I would keep checking all the electrical connections for anything getting hot.
Remember: its not a gasser.
Good luck.