You can check out one tutorial on it here:
http://www.thehelper.net/threads/jass-getlocalplayer.77369/
It was a bit outdated before (since I made it 5 years ago) but I recently updated it.
As far as having your own quest progress, you would use the functions that manage whether a quest is discovered and completed. Here is an example:
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Set TempPlayer = Player 1 (Red)
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Custom script: if GetLocalPlayer() == udg_TempPlayer then
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Quest - Mark <Quest> as Completed
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Custom script: endif
That would mark the quest completed only for player 1 (red). You can adjust the player to whomever you'd like.
The only issue is that certain things can become complicated. For example, let's say you open a gate when a quest is completed, but only player 1 (red) completed the quest. If you fire the trigger right after the quest is completed, and only player 1 (red) completed it (locally), then the gate would only open for him. This has more significance than what you'd expect. Player 1 would see the gate as open but the other players wouldn't. If player 1 runs through it, he'll only see himself running through the gate. All the other players will be thinking, "Wtf, this nub is running into a gate". This is a simple example of a desynchronization, and Blizzard's response is to kick (disconnect) the players.
You just have to be careful in planning. It is perfectly possible to do this and make it all 100% synced (like in Gaia's), but you just have to be sure that there aren't any odd loopholes.
Another thing to worry about is what you put in the GetLocalPlayer() blocks. As you can see in my tutorial, certain things will trigger a desync (such as creating a handle, e.g. a quest), so you want to avoid that. This is a lot easier to do in JASS, but sometimes a bit difficult in GUI since there are a lot of hidden aspects to the GUI functions. The key to solving this problem is to just test often. If you encounter a desync, just post it on the forums and we can help out. Look into kLoader to run tests by yourself:
http://www.hiveworkshop.com/forums/...multiple-warcraft-3-running-single-pc-226287/
Good luck! If you need any more info, just ask. I would be happy to give more examples as well.
