If it's a MacBook with a PCMCIA slot, then you're golden. The new MacBookPro's have Xpress card slots which means you'd have to hook the camera to the computer up via firewire and cannot slip the P2 card directly into your laptop. I have a G4 laptop with a PCMCIA slot... and am just happy with the processor speed, etc.
Use FCP 5.1.1; the studio bundle is key because you get a host of other programs that are necessary for post. The Lacie you have is a great harddrive. I have that exact drive, as well as a 1 terabyte G-Raid drive, to give me more breathing space.
IMPORT your P2 media into FCP and choose the correct sequence setting (Easy Setup menu in FCP) to conform with what settings you shot in with the camera, and you should be able to drop your .mxf files (.mov wrapped) into a FCP timeline and edit with happiness. I have been doing this for a few months, and it has been truly flawless... from the shooting phase to the DVD encoding/burning phase... using the Apple setup/workflows has been phenomenal.
Granted, this response was rather general, but so was your query... happy shooting and editing!
Allegedly, there is an adapter, and it is discussed here. You will note from the discussion herein that the adapter does not adequately address the issue of allowing a seamless card based insert into the MacbookPro. As a result, I believe with the new MacbookPros, the only viable way to interface and xfr files to and fro the HVX is via firewire (1394b):