My hood install was just done a few weeks ago. I followed Charlie's method, but put one of those multi-purpose ladders across the engine bay and put plywood across the top to have something stable to stand on.

I did use a Dremel vibrating multitool with a scraper blade across the entire surface. I also wiped it with lacquer thinner to take off as much of the glue as I could. I wore heavy long-sleeved gloves and a lacquer-rated VOC breathing mask the whole time.

I used 2nd Skin Audio's "Hood Pack" which works quite well. For details, refer to my thread "The Quest for Quiet"

Good luck

Packman

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83 240D - 4 speed manual - Manilla Beige
189K miles, Tachometer mod, cool wooden shift knob from PeachParts, CocoMats, Original factory paint, manual windows, manual sunroof. Starting to add AudioWrap to this car too!