What are some of the issues you need to handle? There is lots of talent here. I have setup more than a dozen networks myself when I was working as a consultant for a company for a while. Things are differnt for each type of setup. If you are setting up a new clean network from the ground up its pretty easy. If you are going into say a workgroup network and converting it to a domain env it can become very messy real fast.
New networks are easy..as for upgrading networks..all I can say is take lots and lots of notes...and when you think you have logged everything you need to perform the upgrade you have only really begun to disect the current network
You need to note current workgroup shares, shared printers, users, who accesses what, how are they doing it, current profiles on the stations, are there other users who use this station and do they have there own profiles, E-Mail accounts, are they running outlook with POP3?, will you be upgrading them from a POP3 to an exchange setup and need to work on the MX records?..etc etc..your goal is to make them not notice any changes...because we know how "they" get. ;-)