One side note-- I installed my Brown-out-Booster (BOB) to fix the problem with the detector resetting on ASS re-start. I did it without removing the glove box from its hinge.
I think you can do the entire install without taking out the glove box. Just follow the instructions for accessing the fuse box: pushing the tabs and releasing the glove box down on its hinge. I think it provides sufficient clearance for you to install the "add-a-circuit" and fish the wire down from the A-pillar.