If you’re ordinarily fine with driving that far, you’ll have no problems.
> at 65y, I made the 40-minute drive there, and 40-minute drive back myself (28x).
> at 79y, my oldest brother made the 30-minute drive there, and 30-minute drive back himself (28x).

Do you have the full bladder/empty bowel routine all set?
> I only had to drink 18 oz of water, 30 minutes prior to treatment; it was no big deal.
> I always used the restroom immediately after each session; never had any issues on the drive home.
> If they don’t overshoot your prostate, you’ll experience little to no fatigue.
> You may spend 10 minutes on the table, but the actual radiation time might be two minutes.
> The table has 6 degrees of movement, so it’ll move you around a little to get you exactly situated.
> You should have no irritation of your rectum if they use a rectal spacer.

This is the easiest part - you just lay still while they do the heavy lifting.