Some advice needed from better Sit N' Go Players.

[AceRat138]

So I recently lost two sit n' goes on the first hand and I am wondering if it was just a bad beat or a bad play. First scenerio goes like this...

First hand comes AA. I am in second position. Raise 150. Guy reraises to 300. Everyone folds. I push. He has Jacks and hits a set.

Very next tournament...

First hand KK. Folds around to me in late position. I raise to 65. Button Pushes. I call. He hits a set of eights.

Now I realize that I had the best starting hand in both situations, but my question is, even with these starting hands, should I risk all my chips this early in the tourney? Would you all have played this differently? If so, how do you play Group 1 hands this early on? I am somewhat new to Sit N' Goes and any advice will be appreciated.

And lastly, can you all recommend some reading I should do for Sit N' Go strategy. I have read both Slanskys Tourney book and Harringtons. Can you suggest any other tournament geared books I should read or any online information?