1. You have to do it often.
2. It can be difficult to pin down your subject.
3. The process is messy, but the results can be satisfying.
4. There are many methods; find the one that works for you.
5. You might be nervous at first, but eventually it will become a habit.
6. It takes time and practice to be good at it.
7. You might sometimes be surprised at what comes out.