Invest in one of THESE
, and a big deadblow hammer (don't use a solid hammer or mallet) and the job will go much smoother.
I've done spring and suspension installs on a variety of vehicles, and the Mk3 Focus is definitely not the toughest job I've done. It just requires some attention to proper procedure.
Regardless, a spring install is not a job that I would recommend to the novice mechanic. Torque specs are critical, and you're dealing with components that, if installed incorrectly, can kill or injure yourself and others. Just keep that in mind.