So, yesterday afternoon I had a second go. I will admit the first attempt was a bit happy go lucky. This time I was careful. I proceeded by stages- A, B and C.- and I left the mortar to harden overnight. Today I'll re-hang the gate and we'll see what happens.
I had a rotten night. I was too hot, I was too achey and every time I fell asleep I dropped right into a torture-porn movie and people were menacing me. I suspect the work I did on the wall engaged muscles I don't usually use.
But that's good, right? Because I need to be taking a lot more exercise.