1.) Don't show much interest, if any at all... be indifferent, because it is very powerful when dealing with hot women if you are the one super-guy who doesn't seem to want them. I recommend that you send a lot of mixed messages too: be indifferent or talk to them in a nonchalant manner and at the same time look them in the eyes seductively, smile, touch, flirt with them, etc. The KEY is to not give yourself away, be too obvious, and become 1 of 10000 other guys she already knows like her. You should use her signals to know when to make advances. So I repeat, you can SHOW her you like her with your actions, but NEVER directly tell her you like her. Both creators were right, but you have to use a combo of the two.
2.) Smile, but not a big ear-to-ear goofy smile, just a seductive grin. Try to make it so you can do it naturally, to avoid having it looked forced and phony. Unless you're high or something, I don't know how you would go around campus showing your full set of teeth to everyone... it just might not look right, so that is one reason for the grin instead. You won't look any less confident, which, incidentally, is what smiling is all about, showing confidence and friendliness. If you're not confident and relaxed, a decent smile is going to be hard to pull off. You need to carry the attitude that you own the dam-n campus, and walk and smile accordingly. She should smile back. I say if it is a girl you bother to even smile at, you might as well strike up a convo as well.
3.) Why not?
4.) I think you stress about time too much. 2nd semester and 1st semester are both excellent opportunities.
5.) Confidence and the resulting "don't give a fu-ck" attitude are a must. Do THIS: next time a girl gives you attitude, push that attitude right back at her. I have done this in the past with women and they all FALL to their knees in submission (well, not literally, but you get the point).... their bi-tch shield is for weak men, you can break it if you just have some balls and be a man. For instance, if a girl upon meeting you says with a bit of snobbiness: "who are you?" as if you are nothing to her, you return with: "I was wondering the same thing about you." or "hang on, first of all, who are YOU?" and you have turned it all around on her, becoming the one in control of the situation. Don't ever get emotional or act angry, just stop caring what others think and learn to turn the tables in those situations. If all else fails, just walk away from the woman and find another one; this can be powerful too. Women only have strong enough "game" for deterring all the wussy AFC men out there, meaning, if you have even a little bit of "game" (I hate the word but no other way to describe it) she will easily be overtaken and you turn her into YOUR bit-ch.