I should add this as a general rule. While slowing down with the bike in gear, as the bike starts to reach 'Idle" RPMs you are most definitely safe to downshift. Keep that in mind and with practice you will learn the RPM ranges of each gear at different speeds. With enough practice and experience on a bike, your brain and body will start working instinctively together, and before you know it, you no longer have to "think" about what to do make your bike do what you want. Though THIS will generally take a few years and hundreds of hours of ride time to accomplish. You'll learn about all that good stuff in the MSF course.
Scottie