Welcome to the forum. I suspect that dealing with HIV was and is more difficult than what you'll be dealing with regarding the prostate cancer. For many of us, the cancer can be removed completely and the problem is, essentially, resolved. Period.
I found it helpful, when I located this website, to spend some time reading through the many prior and archived discussions. The information is real time and first hand from people dealing with this same challenge. My Urologist/surgeon and the hospital provided me with a lot of printed information explaining what would be happening and that, too, was very helpful. And, in your community there may be a prostate cancer support group - if talking with others face to face is something you think will be beneficial.
Before my surgery I went to Rio de Janeiro for a week - to use my vacation time and to take advantage of a free frequent flier ticket I'd earned. I was uncertain about what I'd be able to do, and when I'd be able to do it, post-surgery . . . and I'm glad I took that trip.
My own reaction to my diagnosis and the prostate removal (I chose removal via the da Vinci robotic method) was relaxed because at the end of the day there's nothing I can do about this: I had the cancer, it was diagnosed early, I located an excellent specialist experienced in such a removal procedure, and nothing I could do was going to affect the outcome. I was very relaxed.
Post-op I've learned that my Gleason score was a little higher, and the cancer present in a larger quantity, than the biopsy revealed - and I'm very satisfied that I acted quickly to remove the threats from my body. I felt good pre-diagnosis, felt nothing during surgery, and feel good post-op and have returned to work. Incontenence is an issue I've not gotten under control (yesterday was a particularly bad day) and the "ED" matter is something which, at this point, is of little concern to me.
You've found the spot to come to on the www for solid information about prostate cancer - ask your questions, any questions, and it's likely a chorus of respondents who've faces similar issues will share their/our experiences.