Welcome Trojans!
One piece of advice for you is DON'T pay more than $150/ticket. Last year Texas was the premier game here in Lincoln, and you can easily get tickets 3-4 hours before the game without paying an arm and a leg. Unless you want the comfort of having the tickets in hand that would be the route I would go.
Another option is ebay. Generally a month or so before the game the tickets will be pretty high, but when it comes down the the last couple of weeks before the game, the prices start to drop considerably.
The last option is to wait until halftime. I'm sure when the Huskers build a 7 TD lead there will be plenty of fans that will give you their re-entry passes when they head downtown for a beer! ha :cheers
One thing is for certain if you travel to Lincoln: If you walk 5 blocks in ANY direction from the stadium you'll be safe, even in those dreaded Trojan colors!
Good luck