Lorb told me you wanted some advice, so I'm going to give you some.

Starting with your spec:  Is this a raiding spec you listed?  If so, don't waste those nine points into subtley.  Put them in the assasination tree.  Something like this would do better in a raid setting: http://www.wowhead.com/?talent=f0ebovZMIVobVzxMGot

And a couple of somewhat easy to get gear upgrades:  [Shard of Contempt] from HMrT.  The expertise will help you avoid dodges/parries from mobs, plus the 230 ap procs quite often.  A ton of badge loot: [Angelista's Revenge][Belt of the Silent Path] [Choker of Vile Intent] to name a few.  There's a ton more to get that I didn't list, but getting them all depends on how much time you're willing to spend to get heroics/karas/etc done to gear up for the 25 mans.  

A usefull mod for all rogues is called Slice Watcher.  It creates a large bar that shows how much time is left on slice and dice, and also makes a sound when it runs out.

Those were just a few tips.  I know there are a 5 rogues already in the hamfist/lf1m raids, but if you're joining up mainly to be with some of your friends, that shouldn't be much of an issue.