Honestly, the whole guide takes from original guide of MEW, there: Using MEW Offline (Cold Storage). I deeply thank you to share it to the community, because there are someone whom don't know about this feature, that is helpful. However, I think that it should be better if you add more information into OP, based on original guide of MEW, such as your own experience with it. Everyone will find (or not find, it depends) out some different tips for the same thing. So, if you have something more, you should include in the OP.