If you do your research before you go then you should be OK
You'll need to find out:
1. The encryption type used by the provider in that country.
(I.e.. NTL/Telewest UK use Nagra1 encryption. Sky UK use NDS encryption.
Providers in spain/france/middle east tend to use Conax and IrDeto or SECA2)
2. The symbol rate that the network runs on. We use two different symbol
rates in the UK. 6887 and 6952 (depends on your area). You can usually find
out this information from a subscribed box from that country. This "symbol rate"
is vital to you using your box abroad.
3. The frequency range that the network runs on. You will need this information because you will need create a cables.xml file for that country. Using our "bruteforce" scan files simply wont work.
4. Keys. If you are lucky, then you may find that the box will update itself, depending on the EMU/CAM used, and the network/encryption type. For providers that do not autoupdate, you may be able to manually download the keys over the internet; via the on-screen update menus in some recent images.
You normally find out all the above information by quickly searching google.
Im willing to help where I can.
Liam