Well, I must admit that it's really hard to kite away map guardians. It took me 6 hours to do all of that...
The task is simple: get a decent mouse and try to click very close to the guardian. He will follow. Click very close to the first click and then quickly do the same close to the second click. It is very hard, but with any luck, you will be able to kite the guard away and you will be able to steal the map.
Well, you should be aware that this expends a considerable amount of energy, nerves and time. But in any case, it is doable. Keeping in mind that you can't use a cheat to open up all maps, this is the only way to do it. It takes practice and a lot of dedication. I am aware that few people will go so far, but in the end, it's very rewarding and it always pays off.
As for other tactics... I'm certain they will be discussed later on. I don't think it's fair to other players to ruin their games by discussing something that is for them to discover. Besides, the paladins + phantom tactic has been discovered a long time