Advice on temporary transition

Howdy,

I usually play low buy-in MTT:s - 5.50 and below, a turf I feel reasonably comfortable in and do well, but still don't feel confident enough / have the BR to move on up.

The other day I was bored beyond my senses and entered a 4.40 sat to the 25K guarantee at FullTilt where the buy-in is $100+9. I won the sat and the seat can't be cashed - which is a mixed blessing...

What are the important pointers you can give me on playing higher buy-in?

Thanks in advance