I have been practicing going to the moon using the DG-IV. The MFDs I am using are the Transfer MFD, Burn time Calculator and Orbit MFD. At what point should I been doing a mid-course correction burn to lower my Perapisis?
The general method is to make an MCC halfway to the Moon, then another at half the remaining distance, then another at half the remaining distance, etc, as needed.
Keep in mind that OrbitMFD won't be very accurate until you are inside the Moon's SOI, so don't worry about precision too much during the early MCC's.