By the way, I think "getting out over your skis" refers to a ski jumper, not a skier. If you lean forward and get over your skis after take off, you crash.
Don't think so. Ski jumpers are supposed to get over their skis quickly to achieve a nice aerodynamic shape. Skiers are off-balance when they do this.
I want to say you're right just to avoid it, but I saw this on Quora. It was the most upvoted passage about being out over one's skis.
"It comes from an era when ski jumping was in a transition from the early days when ski jumpers kept their bodies upright and their arm rotation to keep their balance. (Rolling down or rolling up ‘the windows’). As ski jumping evolved, jumpers learned that if they leaned forward bending at the waist and arching their backs into a head foreward and backside high, and brought their hands back, they could sail farther down the hill because their body was in a more aerodynamic position and actually created a bit of an airfoil.
An ex ski jumper named Art Devlin covered ski jumping events for ABC's “Wide World of Sports". As he described a particular jump he would critique the jumper's takeoff and his technique in the air. The jumpers who had the best body positions usually flew farthest down the hill. While they were in the air, Devlin would describe the jumper as being, “Way out over his skis!” If he held the position too long, he may have jumped past the transition point on the hill where the terrain was beginning to flatten out. If he went too far down the hill the landing would be hard and maybe a crash would occur. The term, “Way out over his skis!” thus came into the vernacular. In general it refers to a person's tendency to assume an overly aggressive position, or to hold an overly aggressive position for too long."