IMCR........ A must do !
The IMC is the most important bit of training that a PPL holder can do, the safety benifits are the main reason but it requires a lot of application to get the most from it.
As a new PPL holder with the minimum hours I found the thing an uphill struggle, I think that this was because my instructors were all ex-RAF or ex- Airline and for them there was only one standard. About five years down the line I found the IR to be much less of a problem than the IMC but this was because of the high standard of training I received on the IMC course.
On reflection the IMC was right up there with the Airbus A320 ground engineers course as the most difficult thing I have ever done in aviation................... Apart from getting a Gatwick airside pass but that is a process ( unlike the rest of aviation ) that defies any attempt at reason, logic or common sence !