Sounds like you are going to do great with your triathalon training- my DH and I are both training but we haven't tried a "brick" yet so you are way ahead of us.
I just use a plain rubber cap and to put it on I fill it with water and then I bend over and dump the water on my head and pull the cap on at teh same time. It is a bit of torture but then I find it easier to get in the water and my hair isn't pulled as I try to get the rubber cap over my head. I have tried the lycra caps as well but I found that they didn't stay on very well.
Good luck and have fun swimming