Fresno-Other than rate of closure (how fast in ground speed you are getting there,) it is mostly a hear and feel thing. Relative wind noise should continually get less, buoyancy should continually get less, and stick pressure should continually get less; all this should happen before the landing zone in order to land in the beginning.
The biggest problem with any airplane is using the aileron to align with the runway. Once on final it must be all rudder. Lock the wing level or into the crosswind and walk the center line between your legs. Crabbing until short final is fine for experienced pilots. When we are learning we need the practice holding the lateral drift with wing and holding the center line with very active rudder movement. If you are using rudder pressure, you are behind. You want to be ahead on each side of the line. Move the nose left, right, etc. and don't worry about a little nose yaw. If it is equal on each side and you did it, now sweat. If it is unequal because you waited until Murphy pushed it off one way, you will not correct by just pushing it the other way. You have to push it the other way too much, and then back, and then back, etc. It is much, much, much better if you just start by putting it both sides. Walk the rudder all the way down and then all the way to the hanger.
Download my free "https://tinyurl.com/Safe-Maneuvering" e-book.