Replacing rubber boot seal.

[HPsauce]

Yes, I know technically it's not outside, but then it's not inside either....

My boot seal is badly damaged, from luggage being dragged in and out (not be me, it arrived like that). So I bought a spare from our sponsors when the new shop was offering a massive discount.
It's pretty obvious which bits of trim have to come off, only the big one along the sill (with the light in) looks vaguely non-trivial.

BUT, are there any other considerations, e.g. is it just a push-fit or is there adhesive to overcome, in which case would heat (hairdryer or similar) help with removal.
And are there any tricks to getting the replacement back on? It looks like the "join" is half-way down the left side in both old and new.

The "new" one does have some minor damage, but nothing comparable to the old one which is rather beyond redemption. And as a sometime cyclist used to "rubber repairs" it's nothing I can't deal with.