How: With my hand normally. Though I generally try to change it up by alternating or reverse grip or using "the stranger." I tend to use spit as a lubricant but sometimes use shampoo if I'm in the shower. I have a fear of using lotion, it changed my size and shape when I was younger due to masturbating about 20 times a day. I also occasionally use different materials like silk, satin, or latex. I've tried a couple of times with beads in, well you know were, it felt amazing but I think that would work better with a partner so I don't do it often. I eventually want to try a toy or maybe nipple clamps but who knows when.
How often: At least once per day before I go to sleep using my imagination. I just can't seem to sleep without doing it. On my days off when I'm up at night anywhere from once to four times watching porn (always sensual lesbians)
I have tried the pulsating shower head on... well lets just say the lower man parts during normal masturbation and it feels great. It replicates the sensation of someone else helping out. When I was younger I was a "pillow humper", but I disliked the mess and didn't want to explain to my parents why I had 6 different pillow covers.
My one piece of advise to those who are younger would be to never use aftershave as a lubricant.