You can use a phonetic keyboard layout and most of the cyrillic letters would be exactly where you expect them to be, it makes typing much easier. If you have a Mac, just change the keyboard to "Bulgarian - Phonetic". For Windows you need to install this program and then change the keyboard layout to "Bulgarian (Phonetic)": http://download.cnet.com/Bulgarian-Phonetic-Keyboard-Layout/3000-2110_4-10657280.html

Good luck!
Alex