The most important thing I would say to anybody that wants to use vim is relax! Here are some steps I think will be helpful:

1 ) Install vim with janus and use gvim/macvim. This will allow you to use vim pretty close to your previous editor.

2) Learn hjkl movement and how to move between insert/movement/visual modes.

3) Try to use them as much as possible. It's ok if you use arrow keys or mouse from time to time.

4) Introduce no more than one additional feature a week.

5) Have fun! There is no "right way" to use vim. Use it how you see fit.