HA! Just once. That's all it took for me, too.
I love to look at the first hill I climbed....I remember thinking my friend was absolutely crazy wanting me to go up that hill. Now that hill ain't poop! Heh.
First time I lifted a tire I thought I was going to roll over. My buddy snapped a photo for me as he laughed. Does not look like much but it's an odd feeling the first time it happens.