"What can I expect from guitar lessons?"

Frustration: if the divine master had meant for people to play guitar we would have exited the womb with one in hand.

Fascination: when you finally actually do the B7 on frets one and two you will feel a sense of accomplishment much like the first time you hit what you intended to with a slingshot.

Fourfawk Sake: as you're working hard to do the few things associated with playing guitar that phrase will cross your mind. Don't express it aloud in front of your instructor.

A few things associated with playing guitar

a) Holding the guitar
b) Putting your arm or pinky finger where you want it to rest
c) Holding onto the flat pick or convincing your picking hand to act          in a matter contrary to all common sense and experience
d) Getting the right 'pressure' for strumming, flat picking or finger picking
e) Remembering that your hands which work together when one of them knows what it's doing do not when neither of them knows what it's doing
f) Holding the strings down with sufficient pressure so as to prevent string-buzz
g) Holding the strings down with sufficient lightness so as to prevent deep and painful gullies from forming in your finger tips--and I mean gullies
h) Keeping the nails of your chording-hand trimmed so as to allow a good attack on the strings
i) Determining the best length of the nails for the fingers you pluck strings with and wondering what to do as your nails grow
j) Finding the flat pick for you. Not all picks are equally useful to us. The gamut runs from 'bend them 180 degrees and they don't break' to 'call the friend of yours who pumps iron to try and bend it'
k) How to get the flat pick out of your guitar because you dropped it into the sound hole and it's rattling around inside and that was the only flat pick you brought or have
l) Finding out that ungrateful a$$hole next door who yells at the top of his lungs as he nears orgasm--and you have never once complained--is hammering on the wall telling you to stfu because it's 3:25 am and he's trying to sleep while you practice

OK, so maybe that's a few lessons into your learning.

The reward is the ability to accompany yourself or friends on songs. In two years with application and practice you will be the best guitar player ever. That will last until you have been playing for four years and it will strike you that you really don't know a darned thing about guitar. Then you will practice more with a focused concentration and in a few years, voila--someone will come over and ask you how you did that thing you just did. You will say, and wisely so, "Practice."
l)