A thinner mane will be easier to “train” than a thick one. It will also make braiding much quicker, and the braids will be tidier. Pull the mane, using a metal pulling comb. Don't use scissors or a thinning blade, or the hair will grow back even thicker and will stubbornly insist on flopping where it likes!
Should I pull my horses mane?
Generally speaking, pulling the mane is only required for horses who are shown in disciplines for which you would braid. ... Every time you ride or spend time with him, tug on or even simply brush his mane. Don't try to pull your horse's mane for the first time the night before a big show.
How do you cut cobs mane?
Start at the top and use the plastic mane comb as a guide to get the length you want and keep it even throughout. Once the comb is at the desired spot, take the scissors at a 90-degree angle and cut up into the mane. Doing it this way will avoid the blunt look that results from just cutting across the mane.