There are quite a few boxing pvp movies in the Show-Off forum.
These can give you a good idea what others are doing.

Nothing will improve you more then pvping a lot.

As mentioned the gear makes it a whole lot better over time.

Back when I was 1-boxing, my raiding shaman was pathetic in new to 70 gear.
After a couple of weeks of way too many hours per day of AV's.. I think 16-18 hrs for 15 days...
I had no difficulty taking 3 or 4 players at once, by myself; not saying 1 toon did not still own me at times too.

But overall, as you gain experience and know which counter to use for each situation...
and combine that with crit protection via resilience along with higher ac and health...
You will win a lot of fights with ease, which today would be a complete lost cause.

It does get better with time.