Some directors tell you at the start that they expect you to do everything they say or expect you to interpret the role within the constraints of their blocking or that they'll leave you pretty much on your own, as long as your interpretation of the role fits within their vision of the play.
There are other directors, however, who don't do this. They expect you to figure out what kind of director they are.
Here are some pointers to figuring out what kind of director you've landed:
The Auteur Director:
This director is usually either a schoolteacher or has been one. Used to mapping every aspect of a play, right down to how a line is to be said and what actions have to be made at each point in the play, she will throw a fit if you try to interpret the role. She will interpret the role and you will do what she says, or else!
Such a director will usually:
a. Stop action and direct actors in detail in the middle of a rehearsal, and/or
b. Have copious notes to convey to actors at the end of every rehearsal, and/or
c. Say the lines the way she expects the actor to say them, considering this to be direction
The Stage Director:
Understands that the stage is an actor's medium and expects the actors to interpret the roles. Such a director will enforce adherence to rehearsal schedules (as Auteur Directors do) but will leave interpretation up to the actor. Scenes will be blocked. You will be told when to enter and from where but not how. You will be told where you have to be when you deliver a line but how to get there - in character - after your last line is your problem. Such directors rarely make impossible demands of actors, however. They are open to listening to an actor's concerns (always in private and after the rehearsal) and modifying the action accordingly.
The Lazy Director:
Doesn't really know much about the stage or actors. Usually fancies herself a tremendous theatre personality and expects that simply announcing a production will make it happen. Cancels rehearsals without prior notice. Has favourite actors who are allowed to skip rehearsals.
Needless to say, if a director cancels a single rehearsal without notice (or worse, simply doesn't turn up for a rehearsal and is unreachable) you're better off walking out of the production and never working with that director again.