The best way to get ready is to relax. When you are feeling less-than-good, you aren’t in a vibrational place that will allow your desires to manifest. So the most important part is how you feel, not what you do. That’s why you have to make peace with where you are, in order to feel good. Of course if getting your passport, packing, and imagining your desired destination feel good to you, then they are also helping you on your manifestational journey. If these things create stress or impatient feelings, then they are not helping at all.
The most important part to manifesting is always to keep yourself feeling good as possible, as often as possible.