OK well I have used these and they are simple. Still some basics that I found worked better than just shoving it in and hoping for the best. Like the instructions say, do it before bed so you will be laying down and not walking, it works better that way. The tip is lubricated but it can feel sharp, it's plastic so check it first if there are any defects in the manufacture, like molding or edges that you can just rub off with a fingernail. I kneel down with my head down on the ground almost, with my butt in the air. I hold the enima in my right hand with my thumb on the back. Do insert slowly, let your anus adjust to the foreign body, and it should go right in. Push it in all the way. Squeeze all the contents in, I sometimes use two hands to do this, with thumbs on the bottom of the reservoir.
It feels pretty demeaning at first but you get used to it. Seemed to work great when I was having bleeding around my rectum, cleared it up in a week. Hope it works for you. Oh and have some paper ready, you will want to wipe the lubricant off when you've removed the enima. Use your muscles too to keep the liquid in there while you get off to bed. Good luck.