I've run dual boot with Windows and Linux since the early days of Linux. I didn't answer your survey because they are both "yes/no" and not "yes" versus "no". Couldn't figure out which was "yes".
Dual boot is easy if you use the Linux bootloader to chain load Windows. Getting the Windows bootloader to load Linux is a pain. Things are easier under UEFI partition schemes in comparison to the older BIOS scheme. If you are nervous, and don't have two separate drives to work with, then make a boot restore disk before installing Linux. It is easy to use a live distribution on DVD to restore the Linux bootloader, and this will detect and create an entry for Windows, but Windows needs preparation to restore its bootloader if you later decide you don't want Linux.
If your partitioning is a GPT partition (UEFI), the it is trivial to install Linux to a second disk, and simply set your CMOS setup to point at which disk you want. Pointing at the Linux disk (if Linux was installed while Windows was present) or the original Windows disk is easy from a dual disk install.