i just put in a 1" RB BL (that website above) and it was really easy. just take out the thresholds of all the doors and the kick panels and the panel that the seatbelts for the front seats go into... then the rear cargo threshold.
then under the carpet you find these little black cups (they look like the tops of pringles containers ). pull those up. that will expose the body bolts.
undo those, use a jack to lift the body up off the frame and install the BL spacers and use the longer bolts when you reinstall.