Yes, I used to do it a lot towards the end of high school. Still can, but I need a hot shower and some stretches to limber up.
My dick isn't monster-sized but it's pretty big (two hander), and when I'm sitting/slouching it reaches up past my belly button toward my chest. Never really had trouble curling up tightly and sucking it, maybe it's the proportions of my body, I don't know.
I always thought "self-suck" was an understatement because for me at least, it's really a full body experience. Feels a lot more like "making love to myself" then just sucking. The action is delicious and super-slippery and my pre-cum gives it a sweet tasty quality. I also love the way my cock feels in my mouth.
I swallow sometimes. I don't love the taste as much as my pre-cum, but for some reason I get off on the idea of being completely "self sufficient". There's something really sexy about not needing a tissue...just swallow, lick my lips, and be done. I remember back when I was still scared to take the final plunge and swallow, and I used to keep a box of tissues next to the bed. I'd always back out at the last minute and clean up with a wad of tissues. But then one night after I'd been edging for a while, I was in a passion and decided to put the tissue box on the other end of the room, way out of reach. When the time came, I forced myself to swallow, and it was thrilling.