No problem. It's pretty hard to brick these phones. Lots of people have unlocked gps on the Vogue and I have never heard of anyone bricking one by unlocking gps. If you read a couple guides and follow all the steps you shouldn't have any problems. One of the vip's on this site put together a very comprehensive guide for the Vogue over on xda-developers that has tons of great info on just about everything. I'll give you that link too. Here's a link to codybear's faq:
http://forum.ppcgeeks.com/showpost.php?p=1226335