ribbon cable problems, how to reinstall?

you should never have to force a ribbon cable in. If you are finding them difficult because of size or just hard to push in, make sure the locking clip is all the way in the up position. also sometimes when you think you are putting it in is the right spot it may be a little too low or too high, try using a soldering tool magnifying glass (as to keep both hands free) just to reassure you are hitting the right spot. As for those really small cables, try a pair of very fine rubber tipped tweezers (just be careful not to pinch too hard) or if you can find them a pair of L tweezers, makes getting the ribbon level with the connector a little easier and easier to push forward. I wouldn't recommend using any sort of grease, like you said it will most likely make more of mess than anything. Best thing i can tell you is to take your time and be patient, don't try to hurry the end of the job or you'll end up with more of a hassle than you needed. and if your palms get sweaty dry them off and take a breather, it always seems to help.

hope this helps.