I love my Trek hybrid--BUT does it fit you? Can you stand over it with a couple inches clearance? Can you get the seat where you want it without exceeding the seat post limits? If it won't be comfortable, then it won't be a good deal. You can still "shop" at your LBS's and they will teach you a lot about bikes.
And I agree with going to the LBS with you bike and saying, "I need 2 new tires and tubes. And I need to learn how to fix a flat." Because you do! They will help you change the tires and you will learn how to fix a flat--a good bike shop should provide this service for the cost of tires and tubes! They may even have more helpful advice including local bike paths and local rides where you can meet others :-) Good luck!
Don't stress over the bikes, just get out there! You'll learn as you go, I promise!
"Well-behaved women seldom make history." --Laurel Thatcher Ulrich
'09 Trek WSD 2.1 with a Brooks B-68 saddle
'11 Trek WSD Madone 5.2 with Brooks B-17