I would usually raise to just a bit bigger in early position, it's table dependant but usually between 2.5-3.5 BB depending on which stage in the tourney and the table type. This raise size should obviously be the same size with all your hands to make you less predictable. I wouldn't trap very often at all in that position, because you don't want a huge multi way pot if you have AK or whatever. I also never really limp in early position. I think it is worth building the pot and (later on) stealing the blinds, rather than playing having tough decisions in a weird multiway pot OOP.
In terms of trapping by raising, this can be a valued option. I would shove a few hands with 18-20 BB OOP, but I don't think it is worth it with these hands. You can get more value by giving people a better price and making it easier for them to shove. If the table is fishy, I might still just raise with 15BB or so, because they won't notice what I'm doing and the tactic will still work.
I generally think it is worth being aggressive with these hands in early position, and I wouldn't be afraid to be agressive. I wouldn't 4-bet that much with AA, but I don't think that doing so is a big mistake. Just try not to play these hands completely differently from any of your other hands.
Hope this helps,