Replacing the shocks is very simple. You may need to use penetrating oil to remove the nuts, but other than that you should have no problems. Grab a Haynes manual and it will tell you how to do it, but if you just get under the Jeep its pretty obvious of what you have to do. There are some torque specs and visuals of how the bushings should look like when you tighten them, so you may want to research and get an idea of what it looks like.
All you need is your normal garage tools.
When I replaced my shocks, I was doing other suspension mods at the time so the wheels were off and the Jeep was on jackstands. The only real issue is having enough room to move a wrench under the Jeep. So if you have big enough tires then it should work out fine.
1994 Jeep Wrangler YJ, 2.5L High Output, High flow aluminum intake, 4.0L Throttle Body, 62mm TB Spacer, bored out intake manifold, 5spd, 3" suspension lift, 31" BFG A/Ts, Two 10,000lb tow hooks, DT3000s, Outland lightbar, 5 high powered offroad lights, Mapp Nerf Bars, 102" whip antenna, Midland CB, 6 speaker soundbar, Smallest leaf removed, Air restrictor removed, No trackbars, No swaybars, No A/C, Custom 32 song horn-