Check this out from Mike24
https://www.the75andztclub.co.uk/for...d.php?t=259434
I did it this way and found it was very easy to remove the balljoint.
To get easier access to the 18mm bush bolts, remove the roll bar bushes. It's fiddly but it allows you to lift the roll bar out of the way significantly improving access.
A flexiheaded 18mm ratchet spanner helps too.
Don't cross thread the bolts when you put the bushes back on the subframe. It is really, really easy to to that. You can guess how I know!