They are not bad with the right tools, esp if you have someone who has done it before with you.
Dont forget you are dealing with the spring too. Replacing the lower arm will involve spring removal, but as a bonus, you get new lower arm bushings.
If you opt to use those balljoints, and the bushings are still good, you can just keep the lower arm supported to hold the spring without removing it. Not a bad idea to chain it though.
By now you want new bushings though. Pull the springs and take the arms up to a shop....
