yep, "i think i can" can turn to "oh, f***, i hope i make it", in a heartbeat.
good for you, trusting your partners (and choosing good ones), and for recognizing your limitations.
speaking of getting in over one's head, see my trip report for pics of a route called "brother's folly".
the story goes that two brothers decided that it was too much trouble to hike the 3km around this face to access the peak. so they headed straight up without gear.
incredibly, they were not killed.
from the scree, it's 800 feet to the top, and 1300 feet to the valley floor. all shale and wind packed ice/snow.
we had to check it out, just to see what the fuss was...
great photos, i'm looking forward to more from your next adventure!