Chrome trims

I was lucky enough to purchase some chrome trims for my cabriolet for a very reasonable ?25, I already hane the black plastic mouldings that go down both sides of the car at waist height.

The chrome trims will be arriving already attached to the black plastic trims and I was wondering if it would be easier to take my set off and put the new set on or can I just take the chrome bits out and slide them onto my existing plastic trims?

If I can do this, how do I do it or what do you guys suggest I do?

Cheers.

Whip the old ones off, and bung the new ones on.
Should take about 30 seconds per trim!