Originally Posted by Zorph²
I see you've asked this question a few times now so I'm going to give you the best reply possible;
Depending on how far you want to go with the instrument it is pretty difficult.
Guitar is pretty unique as far as instruments go, for a variety of reasons.
1. You must have a fairly good knowledge of chords, the majority of guitar melodies use a wide range of chords, in addition unlike other instruments the chords move in quick succession, Not whole notes of chords.
2. To add onto the chords there are different version; You have your normal band kid major and Minor chords, but what is unique to the guitar are, Barre Chords and Power chords, just to name a few!
3. As with all stringed instruments, you will have to train your hands to be very quick and very precise for the ability to play notes.
4. It is a bit easier from say a wind instrument because of three things;
Articulation on a guitar is easier, Not that it isn't a technique in itself but it's way harder to shape your mouth and use proper tongue technique to create articulation than it is to pluck or play correct on a stringed instrument.
Breathing control is absolutely not relative to a stringed instrument which is a plus.
Lastly, One great thing about guitars is that they are used in all kinds of modern music. You can easily find your favourite band's sheet music for guitar, but not for say a violin or flute.
5. Reading guitar music is fairly easy if you already are familiar with treble and bass clef, but learning the application to the guitar and fingers will take a bit of time. It's recommended you learn Tablature for a while as well.
Not trying to discourage you, but my philosophy is every instrument presents its own difficulties and the player should be more than aware and willing to take these challenges on, any reward takes a great amount of work to get to.
I wish you luck in whatever new instrument you choose!