Well, all the time I spent combing through the Query Shark archives paid off: I sent out 35 queries, had 21 agents request fulls or partials, and three weeks later, am faced with four offers of representation from amazing agents.
So here's my question: How do you choose which one to sign with? They're all from reputable agencies, their clients sing their praises, they've got lists of recent sales to well-known publishers, they're all gratifyingly enthusiastic about my book. I can see myself getting along with all of them. Given that...how in the hell do I make my choice?? And how do agents feel about being rejected? (I know I shouldn't worry about this, but I ALWAYS worry about hurting other people's feelings.)
Don't worry about rejecting agents. We're much more used to this than you are. Just let them know your decision in a timely manner and thank them for their time. Don't get all apologetic or flowery. This is business, not some sort of romance.
As for how to choose: this is something no one can do for you.
You've asked all the right questions.
What to do:
Make a choice, but don't tell anyone, or the agent. See if you have a sinking feeling in the pit of your stomach the next day. That means you made the wrong choice.
Sometimes your gut will tell you what your brain won't.