You will need to take care to sink the bushings to the proper depth in the subframe. If they are too deep, you won’t be able to get the spacers in between the bushing and the differential. If they are too shallow, the bolt won’t reach.
Once the front tabs of the differential housing are bolted to the subframe, the differential cannot move forward or backward.
You don’t want to try rotating it once it’s inserted in a dry hole. Lube it up and it will work better.
You don’t need to get the orientation perfect, but you want to get in the right ballpark. Otherwise, the bolt holes don’t line up at all, and you cannot get the bolts back into the differential housing.