OK, I'm not giving the master class LOL, but Zoey suggested this needed a thread of its own, so I'm starting it, sharing my experiences so far, and asking for advice and shared experiences.
What I strive to achieve is doing enough enemas that they run clear. Sometimes that has been easy, sometimes it has been frustratingly hard to get the first enema in, sometimes taking several false starts where i quickly get the uncontrollable need to expel too soon--and of course that seems to happen when I don't have a lot of time to accomplish the deed. So I have the following questions:
1) What should the enema fluid be? Plain tap water? Plain tap water with some salt in it? Something else? I presume that anything soapy is going to stimulate peristalsis (evacuating the bowel) too quickly.
2) What temperature is best? My personal experience is that fairly hot water seems to go in easier than cool or certainly not cold water.
3) Is any nozzle better than another? Is something more exotic, like a device which seals so that you can't expel it a good idea?
4) Even with a really clear running last enema, sometimes there turn out to be small pockets of fluids which burp out at the wrong time (like when you are driving to your appointment LOL) as late as a couple of hours after the last enema. Any way to avoid that, or is it just something which is going to happen sometimes?
5) Is it better to hang the enema bag higher (more forceful flow) or lower?
6) What size enema is best? I believe the standard enema bag is 2 quarts? Is that a good size, or would repeats with a smaller volume be better?
7} What position is best? Hands and knees, on the back, Sims position (on the left side)?
8) Where do you do it? I opt for hands and knees next to the toilet. I like the idea of the bathtub, but haven't used it because of concern about releasing solids into the bathtub. I'm not sure if bathtub drains are up to the task of having much in the way of solids.
In terms of trying to accept larger objects or be fisted, I've seen a couple of comments that wearing a butt plug prior to the event may make things go easier. Do y'all find that to be true? If so, should it be something modest-sized or something which is as large as you can tolerate. I'd be concerned that the latter might make you sore and cause your asshole to put out the "closed for business" sign.
Are there any other tricks to have your asshole in a relaxed and happy state of mind (thank you Zoey for giving personalities and emotions to assholes everywhere) prior to the festivities?