When we did it, we used a flathead screwdriver wrapped in electrical tape to help break them open. Took 2 people to do it. One would be trying to pull the lens apart with his hands and the other would use the screwdriver to help pry it open and break up the silicone seal. If you still can't get it, stick it in the oven at a bit of a higher temp. Check on it in short intervals (like 2-3 mins) to make sure it isn't melting anywhere.
The problem we had with it melting at 250 degrees was because we put in the headlight lens down. If you don't do that you should be ok, but I'm not guaranteeing anything. All I can say is to check it often to make sure it doesn't melt.
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