Replacing lower and upper control arm assemblies with new OEM control arm assemblies is super easy and I highly recommend it! Now if you choose to just replace the old dry rotted rubber bushings with new rubber or poly that requires a whole lot more work. You need a ball joint press or press to push out the old ones. I have a 2005 TJ Rubi and when taking turns at speed it got kind of wobbly/exciting in a bad way. Replacing the OEM 2005 dry rotting rubber bushings with new Poly bushings made a HUGE difference in handling. If you search the forum for Control Arms or Bushing you will find others peeps also saw significant improvement in handling after changing out the +/-16year old Control Arms and/or bushings.