Changing province ownership in save games

To change who controls a province in a save game, (notepad works with editing saved games) first look for the province number of the province you wish to change here. The provinces come listed after the Centers of Trade which you can identify by the 'cot' comment as you scroll down.

Now, a province will be listed as such:

---

28={
   flags={
   }
   owner="SWE"
   controller="SWE"
   core="SWE"
   core="FIN"
   culture=Finnish
   religion=catholic
   capital="Borgå"
   citysize=1787.933
   garrison=1000.000
   base_tax=1.000
   manpower=1.000
   trade_goods=fish
   workshop=yes
   courthouse=yes
   fort1=yes
   history={
       owner="SWE"
       controller="SWE"
       add_core="SWE"
       add_core="FIN"
       culture=Finnish
       religion=catholic
       hre=no
       base_tax=1.000
       trade_goods=fish
       manpower=1.000
       fort1=yes
       capital="Borgå"
       citysize=1020.000
       discovered_by="latin"
       discovered_by="eastern"
       ...
       }
   }

Leaving out the irrelevant history bits here for brevity.

Now, all you have to do is change the owner and controller, and core if you wish to have a core on the nation, from SWE to the tag of the country you wish to change it to. Say I want to change the owner to Japan, I will insert JAP into the spot where SWE is. Should look like this:

---

28={
   flags={
   }
   owner="JAP"
   controller="JAP"
   core="JAP"
   core="FIN"
   culture=Finnish
   religion=catholic
   capital="Borgå"
   citysize=1787.933
   garrison=1000.000
   base_tax=1.000
   manpower=1.000
   trade_goods=fish
   workshop=yes
   courthouse=yes
   fort1=yes
   ...
   }
}

---

It's as simple as that. And you can also do a little more tweaking with each provinces stats as well the same way.