if you tame a maewing (fairly easy) and set it to follow (lowest distance) and then get on the equus you want to tame, it will pretty quickly get stuck in the head of the maewing, giving you a perfectly safe and stationary horse to tame!

the maewing can also draw aggro and fend off any nearby enemies that may spot you

(if you want to get the equus unstuck while you’re still taming it, try jumping a few times)