"Eight Ever - Nine Never" means that with eight cards in a suit between your hand and dummy's hand, you should finesse for a missing queen. With nine cards between you and dummy, you should play off the ace and king and hope the queen drops.
Nobody trips over mountains. It is the small pebble that causes you to stumble. Pass all the pebbles in your path and you will find you have crossed the mountain.
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A Skip Bid warning means that you are about to jump the bidding one or more levels. You should use this warning any time you are skipping the bidding. It may be a skip bid to show a strong jump shift or a preemptive suit or jump raise. It simply alerts the next bidder that he should wait ten seconds before taking any action to avoid imparting any unauthorized information.