Crank shaft jig And super strong press. This is not a job to try without the proper equipment.

my father rebuilt my zilla crank wthout a jig.  used a 50 ton screw press to get it apart and assemble.  did it by eye and  checked it between v blocks.  i ran it for 10 years till i had i rebuilt again.  didn't vibrate apart, he did a good job for not having a jig.  obviously a jig makes it so much easier, were around a grand 20 years ago when i looked into getting one.