The first step to hitting your mark is knowing where they are. Throughout the rehearsal process, the director will provide you with various markings on the floor that you must hit throughout different points in the scene. There may be as little one mark, to as many as ten within a single scene.
After you have your marks set, you will need to begin rehearsing maneuvering to them without having to look down. To do this, make visual marks that are at eye level. If your mark is at the end of a table, make a mental note that will inform you to stop moving when you are at this location.
Once you have made several visual markers that will inform you when to stop, you will need to start rehearsing the scene. You may notice that previous blocking will be altered due to these marks. With your fellow actors, run through the scene by moving from one mark to another, you may want to take notes of movements that are awkward.
If after rehearsing the scene you find that several marks are awkward to hit, discuss this with the director. Always make sure that you have a suggestion before making a complaint about a mark. If the director has you moving to one side of the chair, but you find that moving to the other side will be more natural, inform him or her of this.