Need help w/a MTT that I'm playing tonight

[Matt Williams]

I'm playing in a live NL MTT with about 20-25 players. $200 buy in, no rebuys or add ons; $10,000 chips. Each level will be either 20 or 25 minutes.

My question is, how do I adjust to the tourniment being w/o antes. The blinds will be at:
50/100
75/150
100/200
150/300
200/400
300/600
400/800
500/1,000
600/1,200
800/1,400
1,000/2,000, ect.

There won't be any antes. So do I push w/ 8-12 BB, or when my M gets down toward 4 or 5? Is it OK to be pushing w/ any ace or king in EP if I have $5,000 and the blinds are 2/400?
Or should just fold those and wait a bit longer? Sorry if these are basic questions, I usually play cash limit games.