Liberty Landing Marina has a service department who are Yanmar authorized and to automatically extend my yanmar warranty from 2 to 5 years, it needs to be serviced by such a dealer. I asked them to do my 100 hour service and the total cost was 632 dollars which is mostly 4 hours of labor (125 ph I think) and parts.
The sailing lessons are going well. We're improving a lot and gaining confidence when sailing and for me, docking is now pretty routine, at least so far.
Things I bought recently for the boat are more dock lines (5/8 x 50 ft) and a mantus anchor/mooring bridle.