What part makes you uncomfortable? Sending the money, or are you concerned that something might happen that would keep you from arriving? I've had to send money for good guides in several places, and was glad to have the guides that I got. Of course it's nice to hang on to your money until the day you arrive, but I understand that the guides will book up and you have to pay to get a reservation with a good one. Peru is getting very popular, so I imagine the guides want to minimize their risk.

I wish I could go back! I have really enjoyed my two trips to Peru. It's beautiful, friendly and a bargain. I hope to return someday soon.