Gears & Axles - U joints

I was installing my LCA the other day and I noticed that I've got some fluid (trans?) leaking out of the back of my driveshaft. I've heard the infamous ticking of bad U joints could this be the problem? If so, how hard are they to change? Is it possible without any special tools in the driveway? Thanks

I did mine last week with the ball joint press tool from Autozone

I just used a socket and a C clamp. It's pretty easy to do.

If it is the stock nylon filled style use a torch first, and a c-clamp and socket.

If it is the stock nylon filled style use a torch first, and a c-clamp and socket.

True, forgot about that nylon thing. Mine wasn't stock so I didn't have to.