I honestly don't see what the issue is.
Post 1:
"I discovered dowsing years ago when I lived in Aberdeenshire. "
"Discovered", not "started believing in the efficacy of".
"I got a dowser to find a well for me."
He witnessed someone dowsing successfully, it seemed, to find a well.
"He used a forked hazel stick. It was entertaining watching him dowse, he would do a little dance while he was fighting with the stick which would the hit him in the chest with real force."
It was entertaining.
"For some reason it worked back to front with him, but it worked really well."
Reiterating that the dowsing seemed successful.
" I asked to have a go with the stick, and he reluctantly let me try it but with strict instructions not the break it. It did nothing for me whatsoever."
Mick had a go but it didn't work.
" I could not do it then but I can do it now, so it must be something that can be acquired. I think I know how I acquired it but am not going to say right now as you will probably think I have totally lost it."
Mick now believes that he can dowse.
Post 2:
"Until recently I considered dowsing to be complete and utter BS."
He used to think that dowsing was bunk, but now he doesn't.
"Please let me explain. I am getting a new house built on an acreage where the previous house burnt down. I have had to get quotes from various contractors one of whom was a plumber. He asked me to show him the well, and we walked down the hill to where it was, He then proceeded to walk about with his dowsing rods which seemed to act as I had seen demonstrated before on TV. "
He recently witnessed someone dowsing.
"I asked him if I could have a go. I walked towards the area and the rods crossed and remained crossed for five or six paces before swinging wide open. I asked him which direction the water came from, and as I asked him the rods swung to my right !"
Mick tried it himself, and it seemed as if it worked.
"I was gobsmacked, and I think he was too."
He found this surprising.
"He quickly took the rods back again. I asked him what they were made of and he said that they were made of a special metal......"
The dowser took his rods back and said that they were special.
So we have one account in which Mick outlines the first time he encountered dowsing. We have another account in which Mick outlines the first time he tried dowsing and thought it successful. That he now, from the perspective of a believer, says that the first account showed the dowsing working "really well" does not necessarily imply that he thought the dowsing to work "really well" at the time. It's entirely possible that at the time he attributed it to coincidence or some other mundane explanation. It's not uncommon for people to retroactively attribute supernatural significance to things that they didn't think of as paranormal at the time.
For example:
I recall a couple of instances during this wandering-in-the-desert period that helped to bring me home, but at the time I dismissed them as weird or unimportant.
[...]
When I had entered the restroom, no one was in it. As I turned to leave, I saw a lady, who smiled and said that everything was going to be OK. I felt comforted and wondered where she came from—then she was gone. I now believe she was Mary, the Mother of God.
So, you believe it's impossible for the two accounts to be reconciled. I've explained how it's not. Now it's your turn - explain exactly how the two accounts must necessarily be incompatible with each other.