The gasket is supposed to be re-usable -like you mentioned by just putting silicone sealant in any cracks..but you might not want to risk it and get new one.
On removing throttle body cables take special note here how the three cables come off ...they're plastic ends so you want to be careful.
The one closest to the throttle body
is a "ball & socket" connection - it pops off SIDEWAYS towards the throttle body..the next two hook over the prongs--to remove these two turn the throttle (like you're giving it gas) and push them towards the drivers side fender and they pop right off.
See 6:00 on video here:
On reinstallation of cover bolts I just tightened mine up working out from the middle in a criss-cross pattern ---tightened them all about 1/4 turn past snug--no leaks.
Like Pianoman stated replace the grommets and elbows for the CCV while you have it off...they're a headache getting the old ones out...most likely end up busting them out in pieces ..carefully/strategically tap the new ones in with wood shaft.
Name and part numbers: (confirm with parts supplier)
-CCV Elbow with fixed orifice: #47057 (This one I believe is the correct but "will come up" as incompatible with WJ's ...think that's an error in auto parts system..when in reality is compatible..you'll have to verify this)
-Fresh Air Elbow: #47079