Orchiectomy this coming Thursday

Hello, as the title says my surgery is coming up soon, and I was wanting the adivce of people who have gone through this already. What to expect, what level of pain is there, etc.

These past few weeks have felt like a blur since the neoplasm was discovered but it will be gone soon enough. But I'm worried for the future now. I've been having pain in my lower back, and while my urologist hasn't spoken to me on it yet (we just met and scheduled the surgery last Wednesday, which is also the day I had the blood drawn for labs), I can gather from the blood markers in the labs that it is definitely cancer.

I feel like I'm rambling but I'm just so unsure of everything now. It's hard to not feel bad and worry about the worst case scenarios.

I just don't know.