How hard will it be to learn guitar for me?

Just grab a guitar and start stroking the strings, that's the the only way you could find out how hard it would be. Practice is the way to learn, more than any theory. It's rare you haven't tried yet. You need to feel passion for the guitar if you really want to learn. Grab a guitar, go straight to www.911tabs, find a song you like, memorize the chords and play.