In the Vijnana tradition the directives for sitting touch only upon posture: Sit with your back straight, without leaning sideways, forward, or backward. To begin one should pay attention to posture and breath, and then just continue to sit. In sitting everything is okay. We have no instructions or goals, and therefore it is impossible to “succeed” or to “fail.”
Zen master Suzuki Roshi said that if you tie a cow to a pillar, the cow will simply eat all the surrounding grass, but if the cow is free to roam the pasture the cow will find the very best grass. It is thus with the mind when sitting: there is no need to tether the mind to anything.
No matter what happens, everything is okay. Slowly things will happen. We sit on the mat or on a cushion, take notice of the body and breath, and just sit.