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Start with 0 elements in some set.
while the number of elements in the set is less than the number of elements I want the set to have {
---add another element to the set;
}

Stalling.. could be a sign of a loop never ending and doing nothing each cycle. Throw in some printlns and try to determine what is going on as the code runs.

Does it compile? Does it run? Does it appear to work correctly?

If you are stuck on 3b, I see 3b as several parts. About 3 major chunks anyway. First is to figure out where in the list the new...

I feel like I've gotten most of it, but I don't understand how to deal with case 3b?

If you don't understand by reading the instructions, try to compare the rules to a test case.

Case 1: Insert...