It's pretty easy if you have working floppy drive and Workbench
disks that came with Amigas that supported HD and CD.
Making it shine is more of a effort but you can take some things from
AmigaSYS ClassicWB or Amikit to speed things up.Better way (long way)
is to add every patch and library manually as well as right (stable) versions
of software and when something start to crash because you added
something else you delete that something else.My system is rock solid but
far from up to date which doesn't bother me as I like compatibility to old
stuff.