I personally like long, thick manes, so I usually don't do anything but spray in some leave-in conditioner/detangler and comb it out once a week or so.
I bought a cheap pair of thinning shears a few years ago, but they do not close properly, so I've never used them. I do have a thinning comb (I think that is what it is called) that I use for my appaloosa gelding. Since he doesn't have a very thick mane to start with, I do not want to pull it. So that is where the thinning comb comes in handy. Basically, it has a blade between the teeth, so you can cut with it. Leaves a nice edge, but does take some time.
I did roach my pinto arab's mane last August (never doing that again!), and I used clippers. They go through the mane faster than scissors, save your hands from repetitive snipping, and leave the desirable "rough edge."
| Kubie, Appaloosa (RIP) | Patches, Pinto Arabian Pony | Scotch, Paint Quarterhorse |