This is how we did it in Fiji...obviously helps if you have an assistant and an open boat.
1. Lay kite on ground in'ready to pump up position'
2. Attach lines
3. Inflate
4. Lock off struts
5. Deflate leading edge
6. Wind lines
7. Attach bar and lines to pump attachment point
8. Roll kite with bar and lines still connected and inside kite
9. On boat pump leading edge up
10. Have launcher hold kite
11. Jump over and start swimming backwards whilst unwrapping lines
12. Check lines, hook in, Swim yourself into position, launch n go
Works a treat.... they were churning 10 of us out in 30 mins or so.... no problems