4x4Labs removed my XREAS when I had sliders and a bumper installed, pretty sure you can just cut the lines and drain the hydraulic fluid into a bucket and dispose of it responsibly. Then go along the frame and remove the lines. There are write-ups on here that have the proper way to do it. Either way it's not that technical and it's entirely independent of any electrical system so it won't throw any codes.
Rear shocks come off easy just like any normal shock. If you want to maintain your front coils and just replace the struts you can use a spring compressor as suggested, or find a local shop with a compressor and have them swap the coil over to new struts.. that's what we did when we lifted my brothers new model grand cherokee. Call around to local tire/suspension shops to see who has one or is willing to do the service. I think the shop we used here in northern California charged something like $120 to mount springs onto struts.
I'd look into the cost differential between swapping over your existing front coils versus upgrading to something like a built fox 2.0 series front coilover and fox performance series rear shock. If you do the work yourself it may only be a few hundred more but you will gain a nice sporty performance increase versus standard shocks, especially with the loss of XREAS. Not sure what kind of budget you're working with though.