The easiest part sort of depends. Certain spots in the wood carve better than others. If you're near a knot, good luck. The smaller chisels definitely work better, cause you can apply more pressure more easily to one spot, so I've done this whole table with my 1/4" chisel. The chiseling though has been pretty smooth. I have slipped once or twice though, and let's just say there are 2 or 3 minor islands that are no more.
The hardest part is probably the fact that I'm carving it on top of a coffee table, and it's like 18" off the ground. Being 6'3", it's kinda weird. If I had an actual shop of sorts and could stand while working, that might make it easier to work for long periods of time.