Really great start Megan! Yes, getting the leg into the stirrup without bending the knee can be a challenge. It may be helpful to just practice that part low to the ground first so you can drill it, keeping that leg straight before practicing it high. In your video at :50secs it will be easier to sneak the knee through if you keep both feet on longer and turn your hips towards the floor first, before taking the foot off and sneaking that knee through. Good job!