Before you start any work, you should consider all available options if the struts show signs of wear such as leaking fluid or loss of dampening capability. The strut/shock absorber can be replaced. However, rebuilt strut assemblies with springs could be available on an exchange basis, thus saving a lot of time and effort. Assemble the vehicle and check for cost and availability of parts before disassembling it. Cushioning vise jaws using rags or wooden blocks, remove the strut and spring assembly and mount them in a vise. Use a spring compressor that can be rented at most auto parts stores to reduce all pressure from the spring seat by compressing the spring just enough to do so. It is necessary to check this by wiggling the spring seat. While making use of large pliers on the spring seat in order to stop it from turning, unscrew piston rod nut. Now lift off insulator plus upper spring seat from damper shaft and inspect bearing in insulator replacing if required; then take away compressed spring assembly plus set it in secure place like a steel cabinet. Damper shaft must be fully extended while assembling strut starting from bump rubber coil spring and upper spring seat. Ensure that the hole flat side is installed correctly as per direction of installation so that there may not be any mix-up regarding position of the hole with respect to piston rod's flats after putting back together thereby leading into potential disastrous consequences. Lastly, install new piston rod nut with torque tightened insulator; then remove your safety glasses as well as earplugs since I am done operating under highest level protection for person doing assembly process which only remains to put remaining part being removed out during removal thereof altogether followed by removal entirely completed job done ready now itself etc.