Hey guys, I'm going to install AC on my none AC wagon, I think I have all the bits needed - has anyone done this / have any tips tricks?

I've noticed the fire wall already has the pipes that go through into the cabin unsure if they all have this or mine DOD have ac at one point in its life, the fan controls doesn't have an AC button which let's be believe it never had it?

If anyone has had it done at a shop also willing to go down that route for convenience but thought I'd give it a go of possible.

Thanks!