Gently squeeze the bulb and slowly fill your butt with water. Lube up the tip of your enema with a body-safe lubricant (I recommend silicone-based lube), and slowly insert the nozzle into your hole. Most people do not consume enough fiber, which is vital to your overall gastrointestinal health (and makes anal sex easier and less messy - double win!). Incorporating a fiber supplement like Metamucil into your diet can help. Some people with careful diets skip the douching process altogether and are naturally “ready to go” (vegetarians and vegans especially). If you eat a high-fiber, veggie-heavy diet and avoid excessive red meat, your poop will be less messy and more “together,” meaning the douching process will be minimal - which is what you want.
What you eat plays a major role in how “clean” your butt can be. Many people don’t, and you don’t always need to douche to have an enjoyable experience bottoming. You’ll discover what kind of douche you want to use, learn different cleaning methods, or find that you don’t really need (or want) to douche at all. As your skill develops, your douching regimen will probably change.