Faz, with all due respect, do you know any car that has an easier F bumper fitment than the E34? They basically fall off when you take the two bolts off..
I think its best to take the bumper off, I think its hardly possible to remove the grille with the bumper on..
I had mine off just before the Ring trip..IIRC there are some screws in the far corner of the grille that are unleashed from a upward angle.
The grille is held in place on top of the bar that holds the bonnet hinges, make sure you don't lose those clips as they easily fall into places where teh sun dont shine. Several screws are in there but you can easily spot them. Not such a big job
F bumper can be removed by taking off the black trim pieces on the edges ( they are pushed underneath the painted part on the far angles, so don't break them!) , undo the 17mm bolts that clearly become visible after that, pull the bumper to the front and disconnect the wires at the bottom.
W