1. While there are some easy-to-use distributions around,
ultimately, you still have to know the command line (aka DOS) in
Linux. Click click click won't get much done in Linux.
Some commands are very much used in Linux, especially during the
installations of programs
./configure - finds out if you have the necessary programs to
install something
./install - installs the program if ./configure reports no
problems
--help - how to use a particular command. E.G. ifconfig
--help
By the way, it's not called DOS or Command Prompt in Linux. It is
called Terminal or Bash (depending on what you use) in Linux.
Terminal is usually found in Gnome and KDE-based distributions,
while Bash is often seen with Xfce and other distributions.
Linux is also case-sensitive.
While you can do this in Windows - cd desktop or cd Desktop (brings
to your desktop in Windows), Linux doesn't recognize this.
To go to your desktop in Linux, the proper command is cd Desktop,
anything else, Linux will cry out loud that it doesn't exist.
Something to get used to in Linux - My Documents in Windows = Home
folder in Linux. It's called Home, and is either on your desktop or
on the Task Bar (where the Start button is) or both. Ubuntu has it
on both.
There's no more C drive. C drive is now this 
/
There's no error absolutely, it's just a slash. And a forward
slash.
Unlike Windows where everything is spelt out nicely, in Linux,
there's some short forms.
usrs - users
If you wonder where your folders are - look into this folder. Your
Linux log in username is under that folder.
All Linux user accounts also need to be password protected, whether
you like it or not. Windows doesn't need you to protect your
account, but by default, this is compulsory in Linux.
Permissions are also applied differently. This you don't have to
know unless you are an administrator. As a normal user, the usual
permissions will do fine.
Don't tweak the permissions there if you know nothing about it or
you will lock yourself out.
Now on to privileges. All Linux users are normal users with no
administrator privileges. If you need to do anything that requires
administrator privileges, you log in as root (sudo or su or sudo su
via command line does the trick).
Root in Linux = administrator in Windows (with the notable
exception of Vista, but I won't discuss this part, see the Vista
thread).
2. Difficulty in implementing MS stuffs - not so, if you are keen
on alternatives. There's Gnome Office, KOffice, OpenOffice and
others to choose from. But of course, if you are so stuck... there
are ways.
Games are the only notable exceptions. Not many succeeded in
loading a game on Linux that's for Windows. You could find
alternatives, definitely.
Linux is also another pain in the ass to set up. With a bit of
technical knowledge and some help from the forums, you may be able
to set it up, but a minority don't.
Ways to get MS programs up in Linux -
a. Download and install Wine. Load MS Office via Wine.
b. If you have money, download and install CrossOffice.
c. Get a virtual machine such as VMWare or Virtual Box, install
Windows on the virtual machine, followed by MS Office. Run
everything from this virtual machine. If you need the files, upload
it to a file server, download from there. Linux can read these
files as usual without problems.
Paid version of VMWare allows you to copy and paste your files from
the virtual machine to the main machine... so if you want to avoid
the hassle, pay for VMware and just drag and drop your files to
Linux.
d. Dual boot. Install Windows first, followed by Linux. If you need
to use MS apps, boot to Windows. As Windows can't see Linux
partitions... you need to either transfer those files to a portable
device (such as thumbdrive) or upload them to a server then
download it.
3. Yes, I am. For easy-to-use distributions, I recommend either
Pardus or OpenSuse. The latter is more popular and has much more
support. If you missed Windows days, you may want to try Ubuntu or
its derivatives.
4. Download the ISO file, burn it to a CD. Before burning this ISO
image, make sure that you tell the program to create a bootable CD,
otherwise there's no way it will boot up.
If you seriously have no idea how, this program will do it for you
nicely:
BurnCDCC
Download and save this program. Open it, browse to the ISO file and
click on Start. Once done, your CD will automatically eject. This
CD will also be a bootable CD.
After that, get into BIOS and set your CD/DVD drive as the first
boot device. Put in the CD, save the BIOS settings and let it boot
up from the CD.
If you want to be completely Windows free, use the default
settings. The default will just delete away Windows, format and
install Linux. If you want your Windows, partition correctly.
