I did mine (a GV, not the XL-7) single handedly in my drive way, by dropping the control arms - I had no trouble lining up the control arm pivot bolts - you could say that I've done this twice, because a year after the OME install, I went back and changed the control arms because the ball joints were worn, and that repair was also done, single handedly, in the drive way, and again, no trouble.
In terms of front suspension, the XL-7 and the GV (of the same generation) are pretty much identical, so the most significant difference between the two installs, would have been that I was not installing coil spacers - those could potentially make reassembly a nightmare.
With everything unbolted and the control arm pivot bolts loose, I did not have enough 'droop' in the arms to get the OE springs out, I could not get my coil spring compressors in position, so I dropped the control arms - personally I don't see how it's possible to get the coils back in (even the OE coils) with spacers above them, without dropping the arms, but, whatever works for you.