Verizon will want to locate the ONT near your existing external electrical/phone utilities. The battery back up can be up to 50ft away from the ONT, and there is also a power supply, which can be located up to 100ft from the ONT. ONT = Optical Network Terminal. But, it is usually easiest to locate both the battery back up (BBU) and power supply unit (PSU) close to each other and close to the ONT.
The installer may be able to fish the cat5 through the wall you want the ethernet jack placed on, but its usually easier to run the cat5 around the house under the eaves. If you have concerns, I would run the cat5 yourself before the install, just leave the ends unterminated, the installer will have an RJ45 wall plate to cover the hole you cut in the wall.
The information given above about not going in the attic is no longer correct, that used to be the rule, but now it is up to the installer - if they can run it through the attic they will.
I have the 15/2 service plus their FiOS TV service, couldn't be more pleased. Don't have landline phone service, but I do have a Verizon Wireless phone.
Yes, all of that work is included for free. Up to four phone lines (with 4 jacks on each line) cut over to fiber from the old copper, internet from fiber to cat5 to a router (or wireless, plus switches/hubs if you want) and fiber to coax (for up to seven set top boxes, multiple cable cards and analog TVs too) for TV service.
For more information check out :
www.dslreports.com/forum/vzfibermyfios.net/EDIT : If you are concerned about the fiber drop and your sprinkler system, the contractor who will run your drop is only required to have locates done by the utilites (water, gas, electric, phone/cable). You can call Verizon and schedule when the contractor will run your drop so you can be there, or you can mark your yard with your own color flags or spay paint if you know where your sprinkler lines are.
BBU does have to be inside, my BBU and PSU are in a spare bedroom, directly on the other side of the wall where the ONT is.