Sometimes I wonder who gets picked to pilot Star Destroyers - in comparison the process for selecting TIE fighter pilots is better documented. Is it the elite among TIE fighter pilots that end up piloting the Star Destroyers? The pilots that don't quite make it through the whole process of training TIE fighter pilots but nevertheless showed some piloting promise? One would think that critical assets like Star Destroyers (and even more importantly, even larger ships than Imperators) would be manned by the most elite pilots in the Imperial Navy...
God, I love when people make posts for which a potential reply is a Robot Chicken sketch... As for the actual question... My biased opinion is that it's probably a lot like training for being the helmsman on any large ocean-going vessel in the real world.
I once rigged X-wing Alliance to let me pilot a Star Destroyer. There was no cockpit art, obviously (it used the default cockpit for ships without a defined one, which is a shuttle cockpit). Because you were only meant to fly starfighters and light freighters, the game made all of the Star Destroyer's weapons fire forward where the reticule was. Talk about a devastating alpha strike. Also it was slow. And I tried spinning, but it turns out things could still hit me even if I tried a barrel roll.
I mean, it probably really confused the enemy to see a Star Destroyer attempting to spin, jink, and weave like it had a drunken helmsman.
Piloting a TIE and Helming a SD is the difference between operating a 8 foot boat with a 3HP motor and helming the USS Nimitz. Completely different skill sets.
Ok I'll be the geek and answer this one seriously... if you are looking for this tidbit in order to write some fiction, for your RP, or just to connect the dots in that area of the brain you reserve for EVERYTHING STAR WARS.. I will put forth this idea... research our navy, and how an aircraft carrier is captained, that is most likely how a star destroyer operates... you have different officers manning different terminals and ship functions and the captain and his #2 pretty much dictating to them what they want all on the bridge. Submarine movies are a great way to get the gist of a ship (although they are boats I guess) you can clearly see the heirarchy and how different officers man different stations.
Good answer. My opinion is that A TIE pilot would come out of Imperial Starfighter Command. A helmsman on a capital ship would go through regular naval training and be posted as a helmsman on the bridge crew. Their training and selection would be completely independent of one another. To expand on the above you're attempting to compare a F/A-18E Super Hornet pilot with the helmsman of a Burke-class Destroyer. After basic training these two will never see each other again. I'm guessing the helmsman of real world navy ships as well as the Imperial Starfleet would actually be an enlisted rank as opposed to an officer like a starfighter pilot.