@Andy Burrell You must, or should either buy the special tool for the balljoints, or as the others say, the c clamps with the most press tubes.
C clamp would probably be the best as u can use it for many other things i suppose.
This is the one i've got, weird thing is that i got it with a red case, and not blue, even tho it stated blue
Red is definetly nicer tho
Changing ball joints in itself is very easy with this type of press. I used 10-15 mins to press them out, and it was first time using the press, so i had to fiddle with different cups
You will need a long breaker arm in order to turn the threads around when it is under quite much press
Use a small carpenter hammer to hammer around the yoke, you dont need much effort with the hammer, just tap it at a comfortable sound level...
I highly recommend a kit looking similar to mine, ive heard people getting trouble with the budget ones.
I paid around 120-150$ since i live in Norway and everything is expensive here
In my eyes, worth it.
My mind set is, if i can do it cheaper than a workshop can, i'll do it. Even if i've gotta buy the tools for it. That means you can do it more times, for a way smaller cost!