How do I build my horse's boldness and confidence specifically for the boxing phase?

Building boldness in the boxing phase is a progressive process that cannot be rushed without creating a horse that is either falsely confident — working on adrenaline rather than genuine assurance — or genuinely anxious about cattle that challenge it. True boldness is the product of a horse that has been given enough successful experiences with cattle of increasing difficulty that it approaches the work with the assumption that it can handle whatever the cow presents. That assumption is built experience by experience over months and years, not over a handful of sessions. The earliest foundation of boldness in boxing is simple proximity without pressure. A horse that can stand quietly near a pen of active cattle, walk past moving cattle without tension, and accept the sounds and smells of cattle as ordinary rather than alarming has already begun building the confidence that boxing requires. This foundation work — often overlooked because it does not look like training — is what prevents the horse from bringing anxiety into the arena before a cow is even introduced. When active boxing work begins, start with cattle that are cooperative and slow. Allow the horse to experience holding a cow in place and successfully preventing its escape multiple times before introducing cattle that move quickly or challenge the horse. Each successful containment — each moment where the horse holds its position and the cow responds by turning back — builds the horse's understanding that it can control the cow's movement. That understanding is the root of boldness. As the horse's confidence grows, introduce more athletic cattle gradually. The progression should be slow enough that the horse is always working within its current confidence level, never pushed into situations where panic or retreat is the only option. A horse that is never put in a situation it cannot handle develops a working attitude of calm assurance. A horse that is repeatedly pushed past its confidence threshold develops a working attitude of anxiety and self-protection, which is the opposite of the bold, engaged cow horse that the discipline rewards.