I've seen many different ways of doing this job. Some people take off the hood and some people get six of their best friends to help. I used this method 15 years ago on the 280 SE, did it by myself and it was super easy and it still looks good. I used an adjustable handle on the broom so I could put a little pressure on the pad to hold it up while I glued it.
I even had half a can of the adhesive left over and it was enough to do the 6.9 hood today. It's amazing to me that this stuff cost me $6.99 back then and now it's $22 to $28 for a can. This is the good, heat resistant glue that you want to use.
After clean up and prep, it takes an hour or so to install. Start at the top and work your way down.