I would encourage you to not do it alone the first time or so, take somebody with you that has some experience. I'll actually be out there tomorrow for a few days visiting friends, maybe we should have a sit down at the local coffee shop and I can pass on some tips? Let me know.
Either way though, if you do happen to do it alone (which it's not a big deal, today would be a bad bad day to try that though.. and this week seems a bit strong for a beginner) then just be sure to wear a life jacket, tie yourself to the boat if wandering around at all and let a few people know what you're doing and check in when you can.
For the most part though, take a good book. It takes about 4 hours to cross on a sailboat and it's BORING.. relatively, depending on wind of course.
Always check the marine weather forecast before going:
Pacific - Georgia Basin - Forecast - Environment Canada