re: Blowing in insulation: how difficult? And how much would it suck in June?

You'll need at least 2 people to do this. One to keep the hopper filled with the bagged insulation and another in the attic to blow it in.

Doing this in June would not be nice, but starting at 4 a.m. like suggested will get the neighbors up in your face more than likely. That hopper that delivers the insulation by hose is not quiet by any means.

Depending on how high you plan on insulating, how big your attic is, and how difficult, or easy total access to the attic is, it could take a few hours to complete.

I had a company come by years ago after pricing batt insulation that I'd put down myself as opposed to blown in and the price was very close, so I had them come out to do it.

Get prices from installers and you may be surprised at the cost and whether it's worth your time and sweat to do it yourself. And believe me, I'm a DIY guy and I passed on it just to save a couple hundred dollars.