Please, I know how to modofy all in zencart because I did, but I have fear to modify the zones and shipment.

I now have 3 zones for Italy
Italy (with VAT)
nord
sud

and I have charged add on zones table rate, for the courier for Italy and other shipment way pre setted in zencart of italy.

Now I have fear, because I read that it is very very difficult, but I have to add much more countries and so zones and way of shipment, in way to ship to foreign market.

I have also the book of zencart

so....please
someone can say to me in simply steps how have I to do?

also with link or other things, but I pray you in simple steps