Decanting for Dummies?

[rgreenberg2000]

I recently stumbled on an old stash of Freemark Abbey Sycamore Cab 1995. I think this wine is likely at or past (more likely) its peak, so was going to pop a couple of bottles at a party on Monday. I'm thinking that it may benefit from decanting and some time to open up? Any of you who have experience with this wine or decanting (or both) have any recommendations? How long to let it air before drinking? Is it sufficient to just pour half a glass then leave what's remaining in the bottle for air contact?

Thanks in advance for any suggestions!

Rich