3/4 Size Acoustic: I also have a 3/4 Scale Guitar in my apartment because they are awesome to sit beside your couch and just pick up easily and jam with. I bought the guitar a few months ago, and when I was playing it a concerned shopper came up to me and reminded me “that’s for kids you know.” I laughed. Fair enough, but I think little guitars are cool to have around the house, so if you do too (or if you have really small hands) perhaps this could be the guitar for you.
If you just want to learn a few chords to strum along to some songs, then learning to play the guitar really isn't that hard for most people. Many students are able to learn a few chords and get a decent strumming pattern going after a few weeks. If you've had prior experience playing an instrument, you can expect to pick it up after just a few lessons.

Semester Option - $120 per month half-hour / $200 per month full-hour. Semester students pay their first and last month's tuition upfront and are guaranteed no price increases for as long as they remain enrolled. Semester students agree to provide 30 days advance written notice to discontinue lessons, at which time their pre-paid final month's tuition is applied. Some months have 3 lessons and others have 5 lessons, with an average of 4 lessons per month. Semester tuition is PAID MONTHLY IN ADVANCE at the last lesson of each month.
Now I know you might be confused by this diagram, so let's take a moment to explain it. First off, the top of the diagram corresponds to the nut on your guitar, that's the part where the strings end, farthest from your body. Left to right, the strings are 6,5,4,3,2,1. So as you look at the diagram, the string on the left is actually the 6th string on your guitar, the low E string.
String$:  When you're done playing, wipe your strings with a cotton cloth or old T-shirt that's been treated with a small amount of light household oil such as WD-40. This cleans the strings and displaces moisture that can shorten string life. This simple process will extend string life 3 to 4 times compared to untreated strings, saving you money, and giving you more time to spend playing your guitar instead of changing strings.
I have heard how giving you are in so many respects of music schooling and I must say that I am impressed. You remind me of the pure idealism that we had in starting Apple. If I were young, with time, I'd likely offer to join and help you in your endeavours. Keep making people happy, not just in their own learning, but in the example you set for them. 
Guitar lessons can be one of the most useful ways to improve your ability and have more fun playing guitar. Finding the right guitar lessons and the right guitar instructor can be a difficult task: you don't know what you are getting until you try it. Lessons.com is a great space for you to figure out what the best guitar lessons for you are - this can be done with ratings on the site and in extra teacher information. In addition to this, here are some things you can do to find the right guitar lessons and teachers.

Practice fretting the strings. The frets are the metal strips that run perpendicular to the strings that mark each note. To play a note, press your finger down between the metal strips, not on them. To say that you're playing the third fret means that you place your finger on the string in the gap between the second and third fret. If you hear buzzing, move your finger away from the lowest fret and closer to the higher fret. Hold the string down firmly so that it only vibrates between your finger and your strumming hand, with the tip of your finger doing the pressing.
The simplest answer and the one that no student that ever wants to hear is practice. Changing chords is the process where many beginners fail, and quit. But after that, the rewards will be simply impressive. There are a few tricks to get a chord transition to happen faster. Use a metronome: Set it on four beats and set it as fast or as slow as you want. Then get a chord in your mind, say D. When the metronome reaches its last beat, press down the strings. When it happens again, strum it and let it free. Then again. Do this 10 to 20 minutes a day and in less than a week, the chord progression will begin to sound much better.
I have checked out Justin's site and found it to be comprehensive and informative. I have always felt that learning about music and especially music theory applied to the guitar, is helpful in finding your own unique voice on the instrument and expanding your creative horizons. Along with his insight into teaching and his fantastic abilities on the instrument, Justin has created a powerful go-to-place for anyone interested in exploring the instrument to their potential. Just don't hurt yourself.
Intermediate Guitar Class - Open to all ages, from age three to one-hundred sixty-three, but an audition or permission from the instructor is required. This class is intended to be challenging. Topics covered may include movable bar chords, song forms, repertoire development, fretboard mapping, improvisation, and other advanced techniques. New classes start every month and may be repeated as often as you like. Cost is $85 per month (4 hours).