The shop manual has some good advise on doing this. But, when I did it some years ago I wanted to avoid the pain of refitting and adjusting the hood etc. The shop manual indicated the grill could be removed with the other parts in place, but it would be more difficult.
Me being the "why take the road more traveled when another path leads to more excitement-type", chose the difficult way.
After completion I didn't think it was that bad and sure avoided the hood hassle reinstall etc.
It was some years ago and I may forget a step or two, but here goes.
I removed all the lower sheet metal under the grill, the valance and chin. Then reached up from the bottom and removed all the bolts. The ones on the top are hardest to reach, mostly because as I recall I couldn't see them and it had to be done by feel and short arms didn't help either. Be sure and do some limbering up exercises before starting though, your back will thank you. Then I removed the top end stainless steel v-shaped trim. The grill was free to remove then.
I had to replace broken cage nut fasteners. Replacing the grill was tricky with short arms. I used heavy twine to move it into place and hold while securing all the bolts.
Hope this helps.
