I think opening is more down to mental aspect than anything - providing you have some technique as a basic.
I try and prepare myself beforehand, think positive thoughts, think about a couple of aspects of batting you want to focus on (I generally pick foot movement, and something like play with strong top hand).
Then try and turn on and off between balls. Look at something in the distance, then get in position, remind yourself of foot movement/something specific, then watch the ball out the hand and play naturally.
At start of the innings I tend to focus on staying in, picking up runs off bad balls, and seeing off the opening bowlers. If I see them off, that's a victory (their job is to remove the opening batsmen).
From there, get a look at the new bowlers, start attacking when you feel you're seeing the ball well.
If I feel I'm not playing particularly well, missing some balls etc. I might just focus on only playing balls on the stumps to get a feel for bat on ball without taking a risk. Then go from there!
O, and get any advice from your opening partner - either about the bowlers or your batting if he can see anything you might not be aware of.
Just my 2 cents.