When I had been trying to figure out how I'd get to the airport, my husband discovered that one of the families he had tried to invite himself for a Shabbat meal could help in a different way. The wife was going to the airport the same night, but would be detouring first. So, instead of getting a ride directly to the airport, they dropped me off at the train Rosh Ha'ayin train station.
"Where do I transfer to the airport?"
People are so helpful in Israel. And they even gave me the correct directions!
Now, I can't say that "I've never been on the trains here."
PS I wouldn't recommend it without help if you have a suitcase and not enough hands and strength to carry everything you need at the same time, but since I only had "carry-ons," I managed fine, B"H.