Advice on front bumper replacement

I'm about to put back in place the original bumper/spoiler on my 71E (vs. a metal S type one now). They both have all the trim attached so no hassle adjusting deco inserts and so on
I've done my homework and it looks pretty straightforward.
Anything I should be aware of before I get started? Any tricky step where I could use your advice?

Thanks in advance,
Olivier

Where the ends of the bumper attach to the brackets off the battery boxes, shims may be required to space the bumper down so as to not overly compress that bumper to body seal. Overlooked by many, then the bumper body seal is compressed more near bumper ends than portion under the lid.

Great suggestion, thanks Ed!