RE: Too late to put up ladder stand???
I routinely move my ladder stands as the patterns of the deer change and many times the first time I hunt in a new location I often have deer come in. They often are curious, but they never stare at the ladder stand, think oh no hunter! and bolt.
Also, try and arrange it so that you don't stick out like a sore thumb, or they will do the above.
Now if I was after old mossyback, I might be more careful.