The "B" key on my Dell Inspiron 9100 has been working sporadically for the last six months since a hairline fracture developed in the plastic piece that hinges the keycap up from the sensor. I managed to move it into position again a couple months ago, and it worked consistently until last week when the partial break just plain snapped in two. I can use the key without the keycap on by hitting the sensor directly, but the situation was sufficiently unideal that I ordered a replacement from Dell for $19. Sure enough, a nice new flat keyboard that matches my old one perfectly arrived by mail -- but with no instructions on how to install. Since the current one is pinned in place by the casing, I'm assuming I'm going to have to take the casing apart to get inside it. Is there any special things I should look out for? Anything I should take care to avoid?