>>I think the answer to your question really depends on you. I would encourage you to attend an agility trial before you enter your dog (and offer to help!!) so that you know what kind of atmosphere to expect when you are there with your dog. Attend fun matches with your dog if you can find one. How is your dog around lots of people, dogs, micophones, strangers, etc? Is he/she focused on you when you take him to the park on a weekend? I would encourage you to do an indoor trial first if you dog has less than perfect recalls. (I have one dog in excellent and still don't do outdoor trials with the exception of breed national specialties. But I have sighthounds, other breeds are more reliable. >
>>Also, and this is what I've told my students, look at yourself. Will it bother you to spend lots of money and not qualify? Would it bother you to have the least trained dog there? Would it bother you to have your dog not do something (weaves, teeter, not respond to you, etc) in front of hundreds of people you don't know? Some very competitive people feel like they have to go out there and qualify. There's nothing wrong with that, just know yourself. I find people training their second or third (or later) agility dog are more likely to wait longer to compete. I certainly waited longer to compete with my second agiltiy dog. There's also nothing wrong with being excited and anxious to compete as long as your dog is safe with other people (both adults and kids) and dogs. And as long as you won't get upset if your dog isn't "perfect". (I promise you it is 99.9%-100% handler error.)
>>
>>Good luck and have fun, that's what it's really all about anyway.
Qualify!? Yikes! You are WAY up there aren't you!? Must be very exciting to be at that level. The agility trials my club hosts are outdoors and amature. Yes, we do have lots of master people coming out. I am a novice and so is my BC. I usually "try" to tune out other people watching me or my dog, its usually eash because they are concerned about their own dog. We don't have a lot of just spectators on the sidelines. Anyway, I'm looking forward to our upcoming USDAA trial and yes, fun is what its all about 
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Charlene 
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Adopt the pace of Nature
Her secret is patience
-Ralph Waldo Emerson-