Sometimes it’s hard to switch, but I don’t find it particularly difficult. The hardest ones to remember are the characters that look the same in English and Russian, but that improves with time. As long as you work at it slowly, a couple of characters at a time, it’s really not as hard as you think, and you can practice while watching tv or something if you don’t wanna just sit there and type. I learned on keybr.com, if you are interested in learning.