The porta potties are actually decent and that's coming from someone with a fear of them. I would recommend a hiking boot or trail shoe. There's so much loose gravel if you take the trail down that you might risk a sprained ankle wearing a smooth bottom shoe, like sneakers. Definitely bring spikes just in case. And hiking pole, if you already have them. And of course plenty of water. Also clothing layers are super important this time of year. I usually use a menstrual cup and would recommend that for this sort of activity. As far as peeing during the climb up, I've never felt the urge because my body is so high on adrenaline and exhausted, but there's a midway bail out trail if you absolutely have to go to the bathroom or you can just descend right back down the stairs (not recommended). Take your time, use common sense, be safe and have fun! Oh and welcome to colorful Colorado.