I am not trying to dodge your question or be a jerk about it, but I am not really sure there is much detail to talk about. It is just difficult to do (by yourself at least).
The two tips I could provide you is...
1. Drill a couple of the holes a little bigger so you have wiggle room. It was really difficult to get the holes perfect because the drill length interfered with the axle and drag link when approaching it from the bottom. The drill length was also an issue when drilling from the top (because the C nature of the frame, you cannot get a straight/level angle while drilling)
2. I ended up removing one and loosening the other mount (where the motor mount bolts) to help get all the holes to line up. This however made it a little difficult to get the 2nd ORD motor mount on. (I put the dirty dingo mounts on loose, then the ORD mounts, set the engine in, got my mounts bolts in then made sure the engine was straight, I used the stock crossmember position and allowed it to determine the engine placement on the dirty dingo mount)