Pull each end of the tubing in opposite directions, then squish the coil together at the same time. You can also start on one end and push the coils away from your body and together, then work towards the other end. Then I take it off of the item I used to wrap it and twist it some, squishing it down. Mine isn't perfect but as long as it's not kinked, the coils all go down into the wort, and the ends hang over the edge of the pot...it'll do it's job.
Also, I used a ratchet to tighten the hose clamps after the first use or two. Screwdriver didn't have the torque to get it tight enough. Fittings would be nice but it doesn't leak since I cranked it down tight (do this while running water thru it so you only tighten as much as you need. The copper isn't indestructible and you CAN overtighten).