How to slide into a plex
I hope this video will be a handy shortcut for those who have to give the same explanation over and over again :)
It's worth noting that this technique does not always work! Ask any faction warfare fleet for stories about when sliding didn't work, and you'll hear 'em. If your has to do a big turn to go into the plex, that's a drawback and sometimes the enemy may have sensor boosted ship that can lock more quickly. But 99% of the time, this method will work. Remember to click "Activate Gate" repeatedly!!
More information the "slide", aka "Hans Slide" can be found at this forum posting, wherein the discussion over whether its a bug or a feature can be found.