Accrington Web - Is There A Builder Around?!

I would like part of a garden wall knocking down and a gate putting in place same
gate as on the drive, metal black one
I am putting some pictures on so hopefully it will help show what I mean

Wondered if anyone knew who could do this work, or if it is possible and a rough estimate

Just want some guidelines really as have never hired a builder and I don't wanna get ripped off:)

Pic 1: I want the gate to be at the end of that path,
which means cutting part of the pillar out
Pic 2: Close Up
Pic 3: The part of the wall that would need removing