There is no sticker over the SIM card on the TP2, there is a thin piece of metal that retains it.
If you break the piece of metal, a SIM card will no longer be held in place.
To remove the SIM card place your stylus in the hole at the edge of the SIM slot and push it out.
There should be a diagram near the SIM card slot on how to do this.
In order to use the phone with a foreign SIM card, the phone has to be SIM unlocked (security unlocked).
Verizon will give you the unlock code for free if you call Verizon Global Services.
Your Verizon account should be in good standing for them to honor the request.
No need to use any hacks.
Voice roaming on Verizon's network is expensive.
If you are going to only one country it is more cost effective to get a local SIM card.
Data roaming is reasonably priced if you get Verizon GlobalEmail $65/m with a voice plan.
If you have a $30 data plan currently, it will cost you $35 more for global capability.
If you deactivate before a month, it will be prorated.
So if you go for two weeks, you might only end up paying $10-15 extra.
I have previously used VOIP over the global data plan to make calls.
It's not great quality but it sure beats paying $2-3 a minute.
Edit:
Here is a guide on replacing the SIM card...
http://www.myvusers.com/forums/htc-t...ouch-pro2.html