I'm new to the OT, but here's my 2 cents worth.
1. I've read that getting your groceries and supplies is easier/cheaper in Launceston, so I plan to spend time in Launceston getting ready before heading to Cradle Mountain the morning I commence my OT hike.
2. Launceston to Cradle bus is provided by TassieLink on Mon/Weds/Thurs/Sat and McDermott's operate Sun/Mon/Wed/Fri (
http://www.mcdermotts.com.au/cradle_mountain.htm). Seems that Tuesday is the only day there is NO scheduled bus into Cradle.
3. Check out this PDF for TassieLink's Cradle - Lake St Clair timetable (
http://www.tassielink.com.au/_literatur ... 31-03-2014)). It seems to show that the Friday (20 Dec) bus is an 8pm departure from Lake St Clair arriving in Hobart at 10:30pm. Ferry times leave Narcissus something like 9:30am, 1:00pm, 3:30pm and arrive at Cynthia Bay (Bus pickup point) at something like 10:30am, 1:30pm, 4:30pm. There doesn't seem to be a problem with the bus leaving just before the ferry arrives. Ferry contact number is +61 (0)3 62891137 if you want to check the ferry timetable.
Enjoy,
LFRF