Honestly if you currently like the ride, don't plan on offroading a lot and don't plan on adding a lot of weight from skids/bumpers/etc... then putting the OME HD springs really isn't worth it.

But if you notice the front end sagging, want to firm up the ride, plan on adding weight and traversing rough terrain; then they OME springs are definitely worth it while you're tearing down the front end to change the struts.

Disassembling the strut is not "difficult", but it is very dangerous. If you've never done one before, I highly recommend having a friend walk you through it (especially if you're putting the OME HD springs in because the preload is outrageous). A lot of guys end up just bringing their struts to a shop and having them rebuilt there; a shop will have a quality spring compressor that makes the job easy as cake.