Adjusting the length of the shaft on electric trolling motor?

[Kent]

The distance from the top of my bow to the water line is 24". It has been recommended that I get a 54" shaft. I might be able to get a better deal on a 60" shaft. My question is this, how difficult is it to raise the shaft (I don't mean tilt it) so the motor is not running so deep, on a Minn Kota Power Drive trolling motor, for the few times I am fishing really shallow water, and a 60" shaft would drag bottom otherwise? Also, does having Auto Pilot and Co Pilot make any difference on how easy it is to raise the shaft?
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