Single handed sailing on any boat
requires preparation and understanding of controls. I used to have a C25, too, and having the mainsheet right at hand was a luxury we don't find on our bigger boats.
I did a search on single handed on this forum. Try it.
Here's one with exactly the same ? you have!!!:
http://forums.catalina.sailboatowners.com/showthread.php?p=557802&highlight=single handed
We've also had discussions on other boards, like this one:
http://c34.org/bbs/index.php/topic,5445.0.html This is applicable because our C34s and your C30 have similar cockpit and control layouts.
You have to change you rway of thinking
from: release the mainsheet ala C25
to: 1st: feather up into the wind; and 2nd only then dump the traveler NOT the mainsheet because it's harder to get the mainsheet back
Learn how to steer from in front of the wheel. Get away from being a slave to the "behind the wheel" concept.