Several years later...
No, but in all seriousness, I don't know what came into me yesterday. Whereas previously the pain of holding down the strings deterred me because my skin doesn't soften, yesterday afternoon was different. I wanted a guitar to experiment with over at Soundskills, and one of my friends, also one of the permanent volunteers there, gave me one to play around with. And I practised a set of chords all afternoon. I'm still practising it today. And for the first time ever, I was willing to work through the pain.
What got into me?
But the result is staggering. It feels like I've played for a while. :O
The plus side now is that I can not only write songs with the guitar eventually if I keep at this -- I'll be finally able to 1) write parts for guitar, and 2) actually realistically sequence one, even if I'll soon not have the need for it if I'm going to be plugging in a guitar to record for songs. But it'll take me a while. I'm able to play some chords in G major, and I've started by rehearsing only a section of one of my songs, one which you all haven't heard yet.
It feels so surreal. But now, I no longer have the excuse of "being able to play everything but brasses, reeds and guitar." I now can only reduce this to brasses and reeds.