To answer your questions about the anti-rejection meds they prescribe, there usually aren't any serious side effects. They are, however, immunosuppressive so you may find yourself a little sicker than normal (and consequently given anti-virals or antibiotics to make sure you aren't seriously ill).
You will have to wait quite a while if you have bad luck. Organs are a little more complicated than blood and must be cross-matched perfectly. If you are given the wrong lungs with too, you will die almost instantly and your organs will liquefy (no, this is not a joke). Consider that before you get transplanted. CF, however, carries far worse consequences as you get older so it's something you have to weigh.
Many people with lung transplants by good surgeons do well years after their surgery. It's all about will and how well you live afterwards. You'll certainly notice a difference when you take your first full deep breaths.
The best you can always do is hope. Just remember that for a while it's going to be very rough as they make sure your body doesn't reject the new organs. If that happens, you'll wish you still had the CF lungs, believe me.
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