Is it really the right moment to call?

Some months ago a friend suggested someone she knew might be interested in my work and it might be worth while getting in touch. Some months ago. I sent the e mail today. I can't begin to list all the excuses I had for not sending it but basically they all boil down to how do I know this is the right moment to make the approach? If I send it now they might have a head ache, they might be in the middle of something really important and they'll shove my little plea to one side and forget about it, they might be sick to death of unsolicited requests, they have just split up from their husband/wife/partner, their dog might have just died. I don't know these things, do I? And so I put off the email, delay making the phone call. In this case I got an out of office reply saying that they wouldn't be back in until tomorrow. I immediately I decided that they would have such a backlog of e mails that mine would certainly be discarded unread.
What's even worse is trying to work out the right moment to call to find out if the first draft's been read and is it alright? If I don't get an answer to that one within a day, two at the most, I get definitely twitchy. And what's worse still is making the call to ask if the commission we discussed is going to happen. You ring someone up about that one on a bad day and you're buggered before you start. All of this is obviously nonsense, but that doesn't stop it being real - for me.
This morning I talked to a colleague about the commission decision we're waiting on and we worked out what he should put in the email so we didn't look too demanding, so it isn't just me.
On the upside Sea is on it's way to the publishers and the yoyth theatre piece is in front of me, and as soon as I've had lunch, yes, it will be started.

PS. 10pm. Got an out of office reply in response to the query about the possible commission. Won't be back at the desk until September. So that means I've got a whole month to not worry about it.