Just guessing, since I've not done any physical work up there, but you'll probably need a tech to make the connection at the junction box for your area. Around here, that's done anywhere from 815am, to 8 at night, but its supposed to be done by 5pm.
You really don't have to wait until 5 to put things together. To get things done asap, you can plug the modem into power and the phone line, and wait til they are both solid. The DSL light won't be solid if the connection up the road isn't made. You can check back periodically throughout the day to see if its solid, then do the install.
I wouldn't put the disk in until the DSL light is solid. Just to keep people from getting frustrated, the directions tell you to wait til 5pm. But its not necessary, just a blanket statement to keep people from calling the helpdesk when the line isn't connected yet.
Good luck, Kelli