Fitting posts in retaining wall

[mrbg07546]

I have a retaining wall with a fence 5ft. It’s a 1960s retaining wall about a meter high.

The fence has got damage (been in place 30+ years) it has 3 inch wooden posts. I want to change the fence posts so that it’s not wood. (Thinking dirapost via closed board method as centres are 2.7mm
. Would there Be any challanges ito removing post and putting dirapost in its place?

 

[Wayners]

If you need to lift a few bricks to dig out it's not a problem.

 

[mrbg07546]

Thanks. I’ve made a start. Tough work. Concrete