Well there are a couple alternatives:

There is a tool that can be bought for about $125 that allows the ball joint to be pressed in using an H frame press

Some people make use of an AutoZone rental press (I believe this press is likely to damage the ball joint's socket because the force is directed onto the top section of the socket and not the outside ring designed to accept the force)

Pull the entire spindle and find a shop that can get the job done

Or last but not least, rent the factory tool and do the job according to the FSM! I strongly recommend this approach if you want the job done right!

P. S. although it could appear this to be a shameless plug as my factory tool is available in the tool rental section! But seriously having the tool designed to do the job makes it easier, quicker, and less stressful all around. I usually rent the ball joint installation tool, and two ball joint separator tools, one for the upper ball joint (this joint almost any method will easily separate) and the factory separator tool to disconnect the lower ball joint's stud from the spindle (this part of the procedure takes a minute or two with the correct tool and can be a real ball buster taking an pickle forks with one tine shortened, many hammer blows that can't be landed, giant leverage that can move the car off the stands! and lots of swearing an frustration!)