I wish I had have told people they had to pre-arrange visits before they came...
but I didnt think of it and I had ended up with people just showing up when I was trying to rest. Drove me insane! My sister was lierally waiting outside the door of my delivery room, and then when I got to the ward, there were people there waiting to see me (after I had told them they didnt need to come in), when all I wanted to do was have some private time to rest - got to hospital 1:30 am in full-on labour, so as you can imagine, I had no sleep for a long time by the time my daughter was actually born at 10:30am)...

at one point there was 6 people visiting at one time, and I felt that was too much. I could handle 2, but 6 was a bit much. We were lucky in that a few people were thoughtful enough to ring before showing up. So I would definately tell friend/family what you want to re visitors.