If you're in zone, the best advice I can give is to team. On your own, you won't get many kills against savvy players by yourself. With someone else to lock an enemy down and set up for a big hit while you go in for the AS, you'll do a lot better.
As far as arena matches go, try to catch your opponent napping. Go in and wear down their HP with hit and run tactics and get them to burn whatever self heals they have. Once you see them use it (Healing Flames, Reconstruction, etc), go in for a heavy offense and pray. It isn't impossible to get solo kills on stalkers, but it definitely is harder than it used to be.
"the reason there are so many sarcastic pvpers is we already had a better version of pvp taken away from us to appease bad players. Back then we chuckled at how bad players came here and whined. If we knew that was the actual voice devs would listen to instead of informed, educated players we probably would have been bigger dicks back then." -ConFlict
[ QUOTE ]
If you're in zone, the best advice I can give is to team. On your own, you won't get many kills against savvy players by yourself. With someone else to lock an enemy down and set up for a big hit while you go in for the AS, you'll do a lot better.
As far as arena matches go, try to catch your opponent napping. Go in and wear down their HP with hit and run tactics and get them to burn whatever self heals they have. Once you see them use it (Healing Flames, Reconstruction, etc), go in for a heavy offense and pray. It isn't impossible to get solo kills on stalkers, but it definitely is harder than it used to be.
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Pretty much what he said.
And...very close to "almost impossible" if you're fighting someone with half a brain between their ears 
Hokay. So. I have this level 50 DM/Nin Stalker that I really like. My build is PvE focused, but prior to I13, it's a build that I would've been perfectly happy taking into a PvP zone for kicks. I was pretty comfortable in old PvP, and was good enough to be competitive with some of my PvP-focused friends - even though they'd roll me most of the time, I could still put up a good fight and have fun.
And then they changed everything, and I just don't understand it at all. I've been sort of avoiding getting back into it. But recently, these friends of mine have been getting back into the habit of asking me for matches, or to come and fight against them in the zone, what-have-you. And... wow, I suck. Like, a lot. Now, I was never an expert, but I could win more than I lost against other average players. After fighting against some of my friends (not the best test, as they're just better than me anyway and more devoted to that aspect of the game by far) and running around in RV for a while, I got pretty frustrated. I didn't win a single fight, my damage and defenses seemed way, way lower than normal, and basically got my keester kicked repeatedly.
This is most likely because I know very little about how to pilot my character in I13. I did much better in one-on-one fights with my Night Widow under the same conditions - that is, arena matches, 1v1, sometimes with inspirations, sometimes without depending on my friends' preferences. These two characters are fairly interchangeable in PvE (with a slight advantage going to the Stalker), so I'm not really sure what the deal is.
So basically, the long and short of it is that I'm asking for advice. Tactical advice, mostly. I'm really pleased with her PvE build and don't want to change it at all. Assume that I'm a complete newb to I13 PvP, as that's pretty much the case. Anything from the most general advice for Stalking to the most specific advice for DM/Nin in particular would be useful.
The Ballad of Iron Percy