Yikes, Pinching is a controversial word. Generally, "Pinching" is bad. Loose that word and that activity from your bonsai vocabulary. Bad, bad. Partly teasing, but seriously, pinching is an old recommendation, likely from mistranslation from Japanese to English. Especially for younger trees. If your tree has been training for less than 5 years I can pretty much guarantee that pinching is usually inappropriate technique.
Use a scissors. cut out full segment of fans by tracing back along the vein, or stem, to where the fan starts. Hard to explain in words. Normally you don't remove the whole fan, just a segment unless the whole thing is growing the wrong way or out of place.
Watch the video series Bonsai Art of Japan, by Bjorn Bjornholm and Owen Reich and a few others I the episode 4 they briefly discuss Hinoki and you can see the arrangement of the fans of leaves. The ''Pinching'' described is for old, mature bonsai who's style is set. Pinching is done only once or twice a summer, it is not something done continuously. If you pinch continuously you will weaken and kill your tree.
The technique to use most heavily is "shoot selection and pruning", done with the scissors. This is the main technique to use for young trees. Meaning trees that are less than a decade old and trees that have not been to major shows yet. Young trees, more pruning, old trees more pinching. A little of both in-between.