I don’t trim the entire pubic area to that 1/8” length, just the base shaft and small area immediately around it. ie the area that goes in the tube. I like some longer hair above, to give that manly look. And my nutsack trimmed at about 1/4 to 3/8 length so it doesn’t look like one of those wrinkly hairless cats. :)

Re the prickling, the hairs might be a bit short. It should feel a lot better with a few days growth. Also, it can be prickly if it was the first time you trimmed. After a while the hairs (or their support structures?) get softer.

Trimming is fast and great, and it doesn’t have the hassle, stubble or skin risks of shaving.