There are a LOT of resources out there on using Linux, and especially on Ubuntu, the current de-facto distribution for the masses. Transitioning to Ubuntu/Linux is is quite easy and if you are a hands on learner then the easiest way is to start using it.
Seriously - it's really not that different from Windows in accomplishing day to day tasks and shouldn't take a tutorial to figure out. Where it is different is more a matter of how application menu's are layed out a bit differently. As a "for instance", most applications have a "Preferences" dialog under both systems - in Windows it's usually under the Tools menu and in Linux it's under the Edit menu.
Otherwise the main difference in usability is how the main interface menu is layed out. You are, I'm sure, familiar with the Windows "Start" menu. In Ubuntu you actually have three menu's - The logo menu which organizes installed applications by type: Accessories, Games, Graphics, Internet, Office, Sound and Video, etc. You also have a "Places" menu which acts similiar to "My Computer" and an "System" menu which is like the Control Panel.
What I suggest you do is burn a copy of the Ubuntu 9.04 ISO to a CD/DVD and boot from it. It is a completely self contained version of the OS and you can run it in a non-persistent state from the CD/DVD on your current machine. You do not need to install it to run it from your CD/DVD and it makes absolutely no changes to your HDD. It will be a bit slow of course, but it will function just like Ubuntu would if it were installed on your machine. The only place the live cd is lacking is in 3D accelerated support of Nvidia and ATI cards because these are proprietary drivers.
If you are looking for a website with screenshots, I might suggest a google search for
Ubuntu walkthrough