Our KD was way awesome about it. To save us all the awkwardness, I asked him via email. I just *very* basically told him what we wanted, let him know how much we valued his friendship and didn't want this to interfere with that, and told him to take as much time to think it over as he wanted. I said if he decided he was willing to even consider it, let us know, and we would get together to talk it through more. I emailed him on Thursday. He responded that same day and thanked us for the offer and asked to have the weekend to think it over. He said he would get back with us early the next week.
He got back with us the next Tuesday and gave is a tentative, but likely, yes. He said he had a few questions and basically wanted more details, but he was strongly leaning yes. I set up dinner and we all got together. His questions were basically technical (how would it work?) and legal/parental (what would his obligations be?). We answered his questions and gave some more details about the whole scope. He gave us our official yes before we left that night.
If it has been difficult for him, he has not expressed that to us.
He actually seems VERY positive and enthusiastic about it. He is excited for us to become parents. He is very clear that it will be *our* baby. He seems totally fine with that.
We are paying all costs (medical, legal, etc.) and will be compensating him for the actual donation too. He seemed surprised about that, but honestly, with what he is doing for us, I can't imagine *not* compensating him something. But that is just us.
He is being fully tested for STD's/HIV. He will be doing an at-home male fertility test (SA) -- we decided to go that route b/c I couldn't find a GP that did SA, and I didn't want to spring for a RE.
I'm just barely started on this process, but I'll be happy to answer any other questions about *our* journey, if you want.