Habits
The spike carrier does not go first
In one line: If you have the spike, let the others go in first.
Why
If you die first with the spike, the team has to go back for it under fire. Going in later, you bring it onto the site once the angles have been cleared.
How to train it
When you have the spike, stay at the back of the group and call when you are ready to plant: "I have the spike, cover me".