What to do before anal sex?

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A Little Nervous - Need Some Friendly Advice on Anal Prep

Hey everyone,

I know there are tons of threads on this topic, and I've tried to read as many as I can, but I'm still feeling a bit anxious and would really appreciate some personal advice to help me feel more comfortable.

I have a date this Thursday with someone who's, well, generously endowed (around 20cm or even a little bit longer). I've had anal sex before, and it's been generally okay, but this will be the largest size I've experienced. My main concern isn't pain, but rather making sure everything goes smoothly on my end.

I tend to prefer giving oral sex, and I've found douching with a shower hose takes a long time, probably because the water goes too deep. I don't have access to a bulb right now, so I'm hoping to get some practical tips for using a shower hose.

Here are my specific questions:

1. What specific foods should I eat or avoid in the days leading up to my date? I'm looking for concrete examples, not just general terms like "high-fiber."
2. How can I tell when I've finished douching and there's no more water left inside?
3. How long should I hold the shower hose in place before it goes too far? I'm looking for a rough estimate in seconds or any other helpful guidance.
4. How many hours before my date should I douche? Is it okay if I do it about 2 hours beforehand?

Any other tips or tricks you have would be incredibly helpful. I apologize for adding another thread to this topic, but I'm hoping some direct advice will ease my nerves. Thanks in advance for your understanding!