I tightened a Titus Minifix Cam too hard and now I have to take it apart. Is that OK?
It is understandable to be stressed about not breaking your furniture.  

These cam locks can be loosened and tightened more than once.  The cam can only turn so far with pin inserted into it. Just turn them all 1/4 turn counter clockwise to unlock them from the pin, then you may need to tap lightly from under the top at each of the points where there is a cam lock or dowel. Use a rubber mallet or something that will not dent or leave marks, if you only have a regulare hammer then use a piece of scrap wood to protect the furniture. 

When reinstalling the top do the opposite (tap in down). Then turn each cam 1/4 turn clockwise. When you get to the cam that is questionable do not try to take it out as the wood is particle board and you may end up doing more harm then good. Just use the screwdriver to push in as you turn, the pin will prevent the cam from turning to far so snug it up tight but no need to be Hercules just snug to tight not super tight. 

What you do not want to do is unnecessarily turn the cams or turn them more then 1/4 turn when the pin is not in them as that may cause excessive wear on the particle board. The hole is sized to fit the cam. Nothing holds the cam in the hole except for the pressure created by the cam's internal machining rotating against the pin.