You can do the flushes without the enemas but they are very helpfull and make the flush less harsh on your body, you dont want those toxins sitting in your bowels and being reabsorbed. Enemas are no where as bad as you are imagining them to be, you get used to them after you get passed the learning curve and realize this. I was the same way as you before I tried them.
Yes i take all the herbs daily, but I built up slowly adding in new things one at a time. Ill cycle between each bitter after a few days and also cycle between goldcoin grass and chanca piedra every few days. For you maybe just start with the taurine, choline/lecithin, and ox bile/bile salts. These will help you build up good liquid bile which you need to have successful liver flushes.
Im not familiar with Colonix but if it has good herbs in it for cleansing then go for it. Just make sure to research each ingredient in it and what each one's purpose is so that you understand how and why they are beneficial.