Lenox, I have a very compact frame, too, and it does make it difficult to get used to. I hate having a camelback on for long periods, so I have 3 bottle cages (one underneath the downtube) for long unsupported rides.

In addition to the good comments here about practicing, you could also try practicing on a trainer in your living room, if you have one. It is not the same as riding on the road, but you can easily/safely practice keeping your eyes ahead and going by feel to remove and replace the bottles while you are still pedaling.

Good luck!