Assuming their not directional tires (check the markings on the sidewalls)....you should move the backs straight ahead to the front, and then cross the fronts when moving to the backs. This is the standard rotation for rear-drive, 4-tire rotation. I use this on both my Challenger and RAM pickup. and do it 4 times a year (approximately every 3000 miles).
As an FYI, for a Front-wheel drive vehicle, it's backwards. Driven tires (front) move straight back and rear tires crossed to the front.
You're pretty trusting. Just google it, and you'll find this standard tire rotation diagram. There are other methods if you have a full-sized spare that you want to put into a 5 tire rotation, or, like I said, directional tires that can only go front to back/back to front....but this patter has been the same since the 1920's or 30's.