(Q) How similar is the install process from Windows?
(A) Easier. For a start, the Red Hat installer is graphical and slick, unlike the text-based Windows installer. Furthermore, the Red Hat installer does not require a reboot midway through the installation process (Windows XP requires two reboots midway IIRC). It will walk you through partitioning, setting up your mount points, and installing the software you want. You should have no trouble.
If, before you start, you divide your drive into two primary (physical) partitions and install Windows on one of them, then Red Hat will detect Windows on the first partition and will set up the bootloader to boot Windows if you choose it. In this way you can dual-boot your machine in case you're not ready to go 100% Linux just yet. You won't need me to tell you that partitioning your drive will wipe all the data from it, of course.
(Q) How is the user interface of Red Hat?
(A) You get several window managers to choose from, each with their own way of working. The one you will probably choose is KDE: this is the most developed of the Linux desktop environments, and also the most Windows-like. Many dislike it for that reason, but I do not share that view. It is Windows-like though; many of the controls will be familiar to you. It is highly customisable though, and by choosing themes you can make it look just about any way you want.
The other main window manager is GNOME. I personally use Fluxbox.
(Q) Is there a comparable office suite to MS Office?
(A) Yes: OpenOffice.org (
http://www.openoffice.org). It is very fully-featured and its interface very similar to MS Office. It is available for Linux, Windows and OSX, and maybe other platforms too. It is free. If you want to pay, then Sun will sell you StarOffice which is similar but proprietary. Another open-source solution is KOffice from the KDE team.
(Q) What protocol does RH use?
(A) I do not understand the question.
(Q) Is it more stable than Windows?
(A) Historically yes, but Windows XP is very good these days. I don't recall having seen a BSOD on WinXP. I get crashes with X (the graphical server) from time to time. If you run Linux as a server (any kind) without the X Window system then it is rock solid.
Other notes: Linux fosters greater security than Windows because of the convention that you use the machine using a normal unpriveliged user, and only use root (the superuser, like an administrator account in WinXP) when you need to carry out system administration tasks, like installing new software. Also, those horrible ActiveX exploits are ineffective on Linux.
(Q) Will I be happy I made this change in an OS?
(A) You may be. Many people are. But don't take anybody's word for it: pro or against. Try it yourself, and see how you find it. If you have problems, there is plenty of help out there. An excellent site is
http://www.linuxquestions.org. And remember,
google is your friend! Any time you see an error message, google it first!
Good luck!