Things have changed when it comes to parachute training. I just finished DJET this week and can say it's 2 days of nothing special.
First, while going through API you do the standard Para-sailing behind a truck. All of the great PLF practice, and some pool training (parachute drag with the T34 harness).
Once you finish Primary and have selected Jets you now go back to the pool and do your parachute drags but now in an ejection seat harness. You also now perform the "Slide for life" into the bay, feet hit the water release your harness, get in your raft. It's all relaxed and really easy. Basically your DJET training is just an extension of API, only it's 6 months later.
Enjoy