Dead Link Removed
I believe your shackes will be easy since your X is still relatively new and not badly rusted. Skackle replacement ranges from easy to a major PITA (Depending upon bolt removal). If you can remove the shackle bolts then your job is easy (just unbolt the old and install the new over your existing bushings). If the old bolts are rusted in place then things get hard. In my case the shackle bolts were so completely frozen that I ended up having to destroy the bushings just to get them out. It took several hours of work because I kept stopping to think of better ways to do it. In the end I found it is easyiest to drill and burn out the bushings.
I have replace all the bushings in my X, IMO the leaf spring bushings were the hardest PITA ones to do