Squirrels have fuzzy tails.
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Analog circuits are typically not recommended, since they can really badly waste energy.
[...] In fact, it looks like you bought the version with a servo attached...servos allow you to just specify their position and off they go, but you have to do it digitally.
[...] my best advice would be to get a microcontroller with a Pulse-Width Modulation (PWM) output attached to a motor control board [...]
[...] what I need help with though is figuring out how to control its speed and direction. It would be best if I can do this with analog circuit.
The limit switches on a linear actuator are meant to be wired into a motion control system so they don't really control the distance just prevent damage to the motor and screw.