If you're RPing your character to be on a curve in the direction of a different alignment, do you need to ask a DM to set the alignment to the new one, do you need to alert a DM and have them observe you, then have them decide whether a shift is in order, or just do it and hope the DMs notice?

We can gradually shift it as we see that you are behaving in certain ways. If you are about to do something, send a message on the DM channel and state it is for alignment shift purposes and if someone is on and available we can jump in to watch.

That said, I will say I frown on people starting as LN/TN/CN and powerleveling to say 7-8 before they try to go evil so they have the powerbacking. If your character plan includes turning evil, either be evil to start or start with the evil acts from level 2 so we can shift you as you play it.