I half to agree with maniac get the training you need to get the job done it will make things go a lot easer. Also look into software that will make it easer to set up all the computers. I did a major deployment of computers last year (250) and was fortunate enough to have Norton Ghost to avoid having to install programs on etch computer, there are other programs that do the same thing some better some worse it just depends upon how much money you could spend if any at all.
I also set each student up with a login for active directory for the first time in my district using a CSV import (http://www.computerperformance.co.uk/Logon/Logon_CSVDE_secrets.htm). Of course this is only a viable option if you have all the relevant information in digital format. If not you will need to put them into active directory by hand.
Also as I have told all of the techs at our schools don’t be afraid to try something. This is the best way to learn technology is to do it. If possible build a sand box (small simulation network to avoid damage to the active network). But always try
