Check out this WebMD article for what to expect. Several options for the docs to choose from in how to get the sample. Depending on which one they use riding home may very well be an option.
step by step prostate biopsy
And like BB said, good that you're taking care of this pronto.
My father in law was a quirky man and when he was diagnosed with prostate cancer he (in my opinion) wasted time with holistic cures, Chinese herbs, magnetic therapy and the like. Finally when things weren't getting any better he went to a traditional physician and by then it was too late to do anything but prolong the inevitable.
IF he'd taken action quickly he'd still be here today to play with his soon to be 3 year old grandson. As it is, he's been dead a year and a half.
As for me, there's not much a doctor can do to me that is more uncomfortable than being dead. The girls have everyone trying to cure the cancer that starts in their boobs, but not much of a big deal made of the cancer that kills us guys. Guess that means, like most other things with us, we better take care of it ourselves.
Good thoughts to you on your test and the aftermath....
M7