ToxicBunny
Oi! Leave me out of this...
Best is to DIY. Get a drive around where you see people building. Ask for bricklayer and make contact with someone that can build. Decide where you are going to get the bricks and sand from and ask them advice about building the wall. Also ask them or the local municipality for names of a draughtsman that can put the wall on plan. Get the bricklayer to do the job you manage the job. Maybe take longer but will be cost effective in the end.
Be very careful about going down this road if its going to be a load bearing wall or a retaining wall....