First tri is in six weeks...any suggestions?

I'm nearing the six week mark before my first tri! I've had no official training, and I couldn't sign up for formal help on this forum, since my fiance and I are full-time students living on financial aid.

I'm looking for any input as to how to train for the next 4-5 weeks, factoring in a "taper." Right now, I'm basically working out 2-3 hours/day. I'm swimming 3000-4500m five days a week, and running 4-8 miles (speed work or just tempo) runs almost every day, and squeezing in biking 2-3 hours a week. I just saved up enough for a real tri bike, which I hope to purchase in the next few days, but most of my "cycling" has been done either on my mountain bike or in spin classes.

My race is July 25, and it's Olympic distance. If it sounds strange for a self-proclaimed "non-racer" to opt for the Olympic distance, I do well with longer distances...I can handle hours of non-stop workouts in extreme heat, so I think it'll actually be less jarring than transitioning as quickly as a Sprint tri requires.

Can anyone give me pointers? My swim time is under 30:00 (once 27:13) for a 1500, and my run time for a 10K is currently around 52:00. I have no idea how I'll do on a road bike, since the only road biking I've done is on a borrowed bike that doesn't fit me...and on extremely hilly local roads. I've been trying to swim/bike or swim/run in that order, and my only "bricks" have been an hour of tough spin class followed by an hour of running.

I'd love any input as to how to "structure" my workouts. So far, I've just been trying to vary them while doing two hours back-to-back... Thanks in advance!! :-)