[lorispencer]

it would be great to take someone with you that could play the guitars for you so that you could listen to both. Either of those guitars woud be a resonable beginning guitar. In the Yamaha i guess you are looking at the 325 model which is included in a beginning pack of stuff. The Alverez is probably a Regent model. both get decent reviews for their price range. try them both to determine if one is easier to depress the strings and that both fit you sitting down (you can reach over the body).
to watch out for:

Each individual guitar is different - buy the one you play and like. If you get one in the box for the storeroom still in plastic it may play and feel very different and may also have undiscovered problems.

My experience with music stores and female clients has not necessarily been good. probably experience you may have had dealing with car salesman as a female can be similar. very nice to you but don't give you much information and don't want to spend much time with you. just let them know you have a serious interest which is more than sitting around the campfire playing kumbiya.

as suggested before, if you could wait until you had at least begun playing and better still, get your instructor to go with you. Your instructor has a vested interest in getting a guitar that won't discourage you from playing

Your fingers will hurt at the beginning but you will get over that soon. also as a female, if the nails on your left hand are too long so that they push against the fretboard when you play, you can discomfort at the bottom of the nail. charo learned to play with massivly long nails so you can adjust your hand position somewhat if you like to keep your long.

good luck with your lessons and with your shopping