Peace life a river to you and your dad! My mom is always relaxed about the procedures, it is waiting for the results that scares the socks off of us! You will have my prayers and I'll light a candle for your dad. I visit an on-line candle lighting website just about every day. Here's the address in case you'd like to light one on your dad's behalf.
http://www.voicesbeyond.net/Virtual_Candle.html
How was your dad's cancer staged?