There are plenty of ways to couple a trailer.
Only one real wrong way to do it.
top tip if your putting your airlines on before doing the kingpin thats not good.
Also being shouted at for that is ■■■■■■■ stupid.
in an ideal would you do the legs last because assuming both the king pin and brake fails you still have the legs supporting the trailer.
edit: just read.
I have always started with the lines then made my way round the trailer finishing with the clip.
If your coupling up that that is obviously wrong lol. With coupling up the clip is the first thing you put on.
Basically clip is the first thing you put on when coupling up. And the last thing to do when uncoupling. Everything else move around as you want.
Then again there is split coupling which is an entire different thing. Something that I avoid. Because I am not 30st.