Installing Windows 2000 with IIS is not a big task, however when it comes to installing the Active Directory Services (ADS) the real headache starts. It is easy to install ADS on network. But a great task for stand-alone server.
Before starting theinstallation of ADS, you need to clear all the dns zone names and dhcp address. After you do this restart the system. After restarting check again if any instance has been left to be removed. If you have certain that everything is removed. set the ip address to 127.0.0.1(loopback address). After you do this go to Start button---->Run. Type dcpromo in the run box. This will start the ADS Installation Wizard.
Follow the steps for installing the ADS.(Best of Luck). Regarding the challenging tasks...every task is difficult for novice administrator. If you are quiet comfortable, then you can handle any thing.