I switched over to Dvorak about 10 years now. Painstaking at first, but after a couple weeks, you start to catch on. After learning Dvorak, Qwerty speeds plummeted. However, in the last 3 years I was able to be proficient in both QWERTY and Dvorak, and I can switch between the two layouts on the same keyboard, with minimal mistakes. The trick to being proficient in both, is to use separate designed keyboards. I used a standard IBM style keyboard at work and touched typed QWERTY, and at home I used a Microsoft Ergonomic 4000 in Dvorak. Just by using two different feeling keyboards, my brain could tell the difference. After you get your speed up in both simultaneously, switching between both on a single keyboard comes naturally. I've never cared for Colemak. A tip, don't bother relabeling keys, use a piece of paper with your new layout on it, and look at that for reference. That way you can type Qwerty by sight, when you need to type a complicated password, or remap keys. Oh, the shortcut Windows Key + Space Bar, switches between your active keyboard layouts in Windows 7/8.