ORDEAL is indeed an interesting name. The key thing to know is the average orbit height, in your case ~60NM. Make sure that figure is dialled into the Alt knob on the ORDEAL panel. Make sure Lunar is selected on the three way switch, and that FDAI 1 or 2 (your choice) is selected for Rate (not inertial, the default coasting/burn mode). From here, it is easiest to calibrate the “theta” setting (using the slew switch) if your spacecraft X axis is facing “forward” as much as possible, namely with 0 yaw. Next you’ll load V83 and look for the figure in R3, this is theta, or basically the angle between your spacecraft nose (the +X axis) and the local horizontal. If it is close to 0, then you are basically flying “straight and level” and your FDAI should read the same, if it isn’t then that’s when you slew it up or down till it’s the same angle as R3 in V83 reads.
Yes, basically holding the inertial attitude in fixed space as opposed to a fixed attitude relative to the local horizontal, which is what you would be doing if in Orb Rate (approx 0.05 degrees per second pitch up or down). V49 will get you to an inertial attitude and keep you there.
If it’s the procedure I’m thinking, it has a lot of button presses and octal entries? If so, there’s a few ways to cancel: going to P00, or switching to SCS, or changing the DAP load (V48), and probably other ways too. Which is the best? Depends, but they probably are all fine for your purposes, the differences are fairly nuanced (eg if you want to retain the center of your attitude deadband, then V48 should be used; if you don’t care about resetting your deadband, then switch to SCS).
Much more than one liners but hey...!