...still, it was great to see insertion go off without a hitch, and everybody at JPL jumping up and down and finally being happy.

Insertion represented the biggest potential single point of failure, but you're right, the aerobraking phase is months of continual risk at each periapsis. The atmosphere height/density could change unexpectedly, spacecraft orientation could be off a smidge (they're using the solar panels for braking! What cojones!), humans might make a calculation error...but the geniuses of JPL know all that, they're taking each pass slow and easy, with a nice margin of safety. I'd say the Fat Lady's about 90% done singing her song.

Way to go JPL!

--Robert