Jaguar XJ6 suspension

[YoungRestorer]

I have decided to keep my car, instead of scrapping it, but I am advised that the suspension needs sorting:

From worn bushes, to heavily corroded springs, to cracked anti roll bars, the suspension is a mess.

So my question: how hard would a complete suspension update cost, and how hard would it be to do myself? Has anyone done something like this before on a similar car?

Thanks in advance