When picking up a trailer the first thing you should do is forget the stuff you was taught for the test 
- Reverse nearly up-to the trailer and check that the trailer break is on.
- Lower the unit air suspension.
- Reverse until the 5th wheel is under the trailer plate but hasn’t yet reached the trailer pin.
- Raise the unit air suspension until the trailer legs are clear of the ground.
- Reverse slowly until you hear the 5th wheel mechanism click locked. (That’s a click not a loud bang)
- Do a tug test or two and put the break on, then get out and check the 5th wheel and put the dog clip on if there is one.
- Connect the suzies and wind the trailer legs up then release the trailer break.
Uncoupling is the reverse, lower the trailer legs then after releasing the suzies and releasing the 5th wheel clamp pull slowly forward until you’re clear of the pin then lower the unit air suspension and pull forward until you’re clear of the trailer, you can then reset the unit to ride height.