HI Blighty
I plumped for telling everyone including my 92 year old mother. I found out all I could about the PCa first so that I could calm any worries that others might have and in doing so it made me less concerned about things.
I was having the op and so everyone was aware that I wouldn't be able to carry out some of my normal activities for a while and when salvage RT came along there was little explaining to do. Now on HT and experiencing some of the side effects everyone around me is at ease with the slightly altered me.
Because the people I know sure aware of what is happening it has prompted some of the men to talk more openly about it, but more importantly my wife has been able to talk to her friends openly when she has felt the need for a bit of support.
I think that being open about it all takes away any pressure and puts it all into context, or it certainly has for us. If there is ever a time when I might be tempted to feel a bit sorry for myself my wife will generally listen, give me a smile and say "Don't big up your part sunshine". This makes me laugh and things are back to normal.
You know yourself, your family and friends best.
All the best with your treatment.
Kevan