You need to just sit and relax.Take a proper posture. Expell the stale air.Do Guru yoga.Then relax. As one's mind slowly subsides, a vivid, clear and energetic radiance will emerge. This is not rigpa itself, but is instead the radiance aspect of awareness. Relaxing in this is the essence of tregchod.If it does not arise-- it doesn't matter-- it is there anyway. If it arises, it doesn't matter, since there is nothing one can do to cause it to arise, nor will it ever subside. But it is revealed when one is sufficiently relaxed.If thoughts occur, it doesn't matter, since thoughts do not exist outside of this state. If there are no thoughts, it doesn't matter, since this radiance is not product of stillness, no more than the lustre of clear water is a product of the settling out of detritus.When one can "see" the radiance of awareness even in the midst of the chaos of concepts, then one's tregchod is moving ahead.Otherwise, just relax and integrate into your primordial state.A few words of advice on tregchod written by a so called "dzogchen pa" named Namdrol.